Not necessarily a romantic one. Just curious.

I was "friends" with this girl once. She had a crush on my brother and threatened to kill herself if I wasn't friends with her. My brother found out, told her to leave me alone, and she tried to kill herself, but failed. Last I heard she's in a psych ward

How did you deal with it when she told you about it though @mightyoak ?
My friend is kinda forcing me to date this girl because she's always third wheeling with him and his girlfriend :/

I tried my hardest to make the best out if a bad situation, but all wanted was for me to give her his number and have him add her on fb and shit like that. I tolerated it, but in the end it was my brothers decision.
Also, let your bro how you feel. Don't date her because of that. If she's always third wheeling, find out a way to get her to entertain herslef

Yes. You should never force or be forced into a situation that you're uncomfortable with, if your friend respects you and cares about you then tell him how you feel and he should stop bugging you. A relationship is a commitment and if you're not going to be willing or committed, then just don't do it.

Tell the friend to go fuck himself or man up and tell her she's being a third wheel. Or do it yourself.