The best advice you can give your friend is to leave the guy alone. As the guys already stated above, she's not responsible for the guy in no way, not to speak of, that guys like this are attention whores, whining online that they're going to do stupid shit to themselves. If I've learned something in my 26 years here, it's this: There are usually two types of people surrounding you in terms of relationships:
#1 The ones who will eventually hold you back, waste your time, keep you on a certain stage of your development.
It's the typical student - teacher relationship problem. When the student outgrows the teacher, the teacher can do 2 things:
- let the student go.
- lie to the student to keep him from developing further keeping the relationship afloat as long as he can, while holding the student back.
This can be applied to any kind of relationship. So if the "teacher" doesn't let you go, you got to cut him out. If the person doesn't contribute to your happiness, your development, if he is holding you back, you have to cut him out, leave him behind, even if he isn't able to accept it after you've explained, since even if he doesn't get it, even if it's "not his fault", that doesn't help your problem.
#2 The other type is whom with you can have mutual development. Each of you contribute to the other's development, happiness, value etc. Often in pick-up theory this is described as the ideal relationship, but this isn't only applicable for romantic relationships, it's universal in context of any relationship in my opinion.
Personally I've met tons of people like this one
>>1 described. I've even lived with a person like that. Sometimes they don't even realize how much they leech off of another person. But what I've always found true was the above rule. Anyone who couldn't have a mutually contributive relationship with me has either slowly cut contact, parted ways with me, or vice versa. I think accepting this and being honest about it is better than trying to cling to something that will collapse inevitably.