Ok. How to start this? My best friend has been cutting and she is always wishing she could leave this world. Luckily, she is very considerate of the future and she doesn't want to make her brother and all her friends sad, so she doesn't plan on killing herself anytime soon (I think). I'm really worried this will change though because she seems to be thinking even more pessimistically and today she got a suicide note from her boyfriend. I'm scared she's gonna try to join him since they were really close and she already hates her own life. I don't know how to help! I've been a loner for a good portion of my life so comfort skills aren't the best and I feel like if I try to say something, I'll make it worse. Please help me > _ <

Thats a bit of a tough one
been in the same spot before, and to be honest, sometimes ending things seems like a quick fix, but the issue with that is that if you drop out of the race then there is no going back. There is always a chance, and opportunity for things to get better, but ending things robs you of that chance.
You can never have a better life, you can never do the things, or try the things that will make you happy to be here. ending it is a dead end solution for a temporary problem, there is no coming back from that, once its done then it is done.
you would need to help your friend realize that what they are going through is not something that will last forever, and if necessary you would help them make things better, or at least help them find out how to make things better, and if you think theres no talking sense to them then you might need to tell someone about this to see if your friend can get help.

trust me, you dont want to be the person who kept quiet just because you thought it wasnt your buisness to butt in on their personal life.....you wont be able to forget something like that, and not just you, but the people around you, their families, heck everyone might end up losing someone who could have done something better with their lives.

now i know what im saying isnt the sure fix or much help for your issue, but i hope everything goes well for you guys.

Thanks so much for the advice! I definitely agree I'll have to try my hardest! I hope it turns out well. Thanks once more!