Okay, so here is the story of a pretty...sad guy who goes to my school. This is important, because I want you guys to help me with this...

So, let's call this guy "Jon". Then there's me, and some hot chick we both know named "Britt". Now, me and Britt are pretty interested in each other, yada yada, all that shit. Now, about two years ago, Jon and Britt went out for a few weeks, but broke up before becoming freshmen. Now, I've known Jon since we were in middle school, years ago, so we were bros. However, over the years, he started hanging out with some other friends, and I went with the guys in mechanics and all that. Now, I've grown over the years, but Jon really hasn't. In middle school, and once when he was a kid, he got held back a grade, so he's about a year older than I am...

He has a total lack of social skills. Quiet talker, runs like an anime character, talks non-stop about Pewdiepie and Youtube poop, and uses his [fucking amazing] art skills to draw pointless stuff to get attention, and try to attract other people. He's also white, lanky, Shaggy-style beard, acne, etc, so he looks the part as well...not that I'm one to judge by looks.

Yet somehow, with all these problems, he ends up being able to go out with Britt. After they break up, she hooks up with some dude who's Jon's friend. Jon becomes obsessed with Britt, and get's pissed of when another guy so much as says "Hi" to her. So, whenever her and her new BF talk, he suddenly gets silent, and lowers his head. Everyone else is acting normal, when he suddenly slams his fists down on the table, or whatever, and storms off. His babyish pouting and outbursts always end up causing the girls to leave and try to calm him down, after which he then has them stay with him. Other times, he waits until Britt and her BF leave, before doing the same thing, and ranting about how he's "going to really murder" the BF. Skip forward to this year...

They have now broken up two years ago. He still doesn't have a girlfriend, because either he creeps out other girls, or he rejects them, as he's STILL obsessed with Britt, who's really good friends with me by now. Out of all the classes we take that he could be in, he's in our Theatre group. I find out that he secretly hates my guts, because I'm friends with Britt. This whole time, I thought we were good bros, despite his awkwardness...

Now, he get's upset whenever any guy talks to her, remember? So how does he react when I sit by her, and we joke and play around all the time? Well...he hates it.

And now I get to this part: How he handles it.

1: Monday- We're cold-reading a play. Britt is playing the part of a wife. Some older man is playing the part of a creepy Russian man, who just so happens to be hitting on the wife.

Just for reading out the parts, this guy gets put on Jon's bad-list. While everyone else is laughing at the scene, Jon is hunched over in his chair, staring at them angrily. Just when I think he couldn't get any angrier, I get chosen to try the part of the Russian man. Now, he's pissed.

2: Tuesday- I come in late, having spent some more time than intended down at the library. When I finally walk in, Britt runs up, we playfully argue, etc. I take my seat and start talking to her and one of her girl friends. This annoys Jon, who turns away from us and crosses his arms and legs. We keep talking. Eventually, he get's too fed up.

He carries around one of those military-style Mollie Bags, and it weighs about 80lbs, since he carries EVERYTHING with him. He gets so mad, he kicks this bag, and sends it flying several feet until it smashes a chair, almost hitting some random girl. He doesn't say a word for the rest of the class.

3(my favorite): Wednesday- We are once again cold-reading a play, a British one, to be precise. As we start, I turn around and start joking around with Britt again. Jon of course, Hunches over in his seat again. He gets so mad after five minutes, that he punches himself in the head, in front of the whole room. We keep talking for a few minutes, then I turn around and listen to the play reading. Even though we're no longer talking, he's still angry, and so he elbows a brick wall as hard as he can. About thirty minutes later, for no reason, he starts punching himself in the face repeatedly, then walks across the room and retreats into his own loneliness.

Now, I can easily ignore this guy, since I don't care. Actually, he's more of a slight annoyance than anything, but I also know that he's a hassle for these girls. He also seems to worry his closer friends, and I'm even worried, really, as someone who knows him. I mean, he's obsessing over this girl, who already has another BF, he gets angry for the smallest things, abuses himself...so, what's your take on this? I feel that as a buddy, I should at least help out a little.

That... isn't normal. I've had a guy get hung up on me for a couple years, but the level of this is just ridiculous. It's past normal, past odd, is past creepy, and is at borderline stalker. He's got some serious attachment and anger problems, both of which need to be addressed, because his life is going to be hard if he acts like this with every girlfriend that breaks up with him. Also, he seems kind of dangerous. Considering how he's acting in class... Are you sure he's just ranting about taking physical action? He doesn't sound like he's right in the head to begin with - god knows what he's really thinking about doing.

I can't really think of anything that you could do for him :L
It's one of those rare cases where I'd say he needs a counselor or something. (If it were me, I'd get the parents involved, but most people are afraid of that.)

While it is understandable that you turn to people's advices, he sound a difficult one. Not that I don't understand his feelings, though. However in "Jon's" case, he doesn't really seem a creep or abnormal in my views. Seeing he resort to his anger, meaning he doesn't really know to how to vent properly or something else to think about. I mean, surely, there must be something else going in his mind other than Britt, 2 years is a bit long in my opinion.

In fact, I think he's using Britt as a excuse to express his frustration in life, and he certainly doesn't know where to let off his steam. My theory is; Jon doesn't really like Britt at all, he's just using her. His status's kept lower and lower, no social skills and anger management problems, this young man is a mess. And this is obviously not Britt's fault if that needed to be point out.

Bottom line, regardless of what I think, I think everyone can agree that Jon need counselling and perhaps see a doctor. You may not realize it but his mentally health poise a danger for himself and his future.

He does sound like a sad guy but in the end, he's just need help . Best talk to him, he may get upset and denied it but at the very least, he will knowledge he got problems.

That is not normal or healthy. Really.. he should talk to someone. Tell someone what he feels and let that person help hin to handle it.
I don't think he actually will easily go to someone to get help... but that it was he needs to do.

(be grateful that I answered this; I paused Reservoir Dogs to type a reply)
But yoooooooo Jon needs to calm his jets. Britt clearly is not interested and his behavior is dangerous and self-destructive. You need to convince him to see a counselor about this.
However, as a general rule, people in his position don't take well to the suggestion of therapy. I know someone with very similar anger issues who had to be taken to a mental hospital by force because of a violent outburst which had originated as something similar to what Jon is exhibiting, and that's not fun. If he won't listen to reason about this, you're going to have to speak for him. Makes you look like a douchebag, but it's better that he reluctantly gets help than not getting help at all.

Definitely, definitely go to a counselor if you're comfortable enough to do that. I'm surprised he hasn't already gotten in trouble for how he's been acting in class.
You probably haven't been talking to him lately either, but that might be part of the problem. Try talking to him to ask him what's wrong or see if you can get him to express what he's actually feeling, maybe? Or try to make him feel like he's included...

I don't know how to respond to this but either just be cool with him for or leave him to his own devices cause chances are he'll probably snap and you're the first one he's gonna vent(Violently) his anger...

He really needs help, but if he hates you then there's nothing you can do to help (if you were close maybe he'd listen to your advice). You could bring it up with a trusted school staff member who could possibly get through to him enough to get him to get a counselor but that pry wouldn't work either, I really don't know how to help.