When someone thinks EVERYONE else is wrong, the same, has problems etc... it is THEM that has a real problem...
Tell her what the other members have said...
"I do care about you, but this is goodbye-- have a great life..."
Then if you get the "you are just like them" lines again...
tell her: "Don't you think there may be a REASON you think all us guys are exactly alike, and always leave you? It is because YOU have a problem... Get help...I can't be with you anymore--goodbye."
And NEVER look back.
Remember: SOME people will hurt themselves just to get your attention...
from the sound of her.. she might--
BUT: It is rarely a serious suicide attempt--
usually pills (enough to puke or pass out-- but not life threatening) or cut themselves enough to look scary but not do any real damage...
IF this girl does something like this--
DO NOT FEEL GUILTY!
DO NOT CALL!
DO NOT GO BACK!
DO NOT GO VISIT!
It is exactly what she wants--and it helps reinforce her actions-- she will continue to do this type of thing any time she doesn't get her way... and someday, she may screw-up and really hurt herself, or someone else!
And whether or not YOU think her folks are of any help --
remember, they are her parents!
No matter how long you've known HER- you do not REALLY know Them...!!
Send the letter-- or even just a note to them that she has been threatening to kill herself and that you are concerned, but can not be involved anymore....