Search Results: he becomes distant towards me

First some background. She's chemically imbalanced and suffers from extreme mood swings and depression. Over the course of last spring/summer we became really close and had a lot of fun together but since last November she's totally changed towards me and I don't know why. In December she had to go to a psych inpatient for several days and has become increasingly more distant and at times even hostile. I've been patient considering her troubles but in the course of the last month she's said I wasn't a priority to her because of a misunderstanding and has been ignorning me for more than two weeks over some nonsensical drama. I'm really out of a patience and don't know how I can even go about making things better with her. But I know if I give up on here, there will be no going back because I have an extremely dysfunctional family. What should I do?

LONG STORY... sorry.

So this is a messy situation, so I heard some rumors about this girl that was dating my closest friend at the time. The rumors where about her cheating on him with multiple people... anyway things got intense when everything was out in the open and because I didn't have any real evidence/how hurt he was by all this I backed off and apologized and really stretched to make it look like I was wrong and she was innocent... but I always had doubts.

A few months later they eventually broke up and he indirectly pointed towards what I did as the reason for the breakup and our friendship never recovered (we are like distant acquaintances now when we use to be like brothers)... are friendship is almost dead.

A year after their break up she contacted me, we started talking back and forth for awhile and we then met up a week later and things got heated/we fooled around (she basically threw her self at me). I was confused by it all but was interested in pursuing but she became incredible distant/passive aggressive. I found myself becoming very frustrated by what she was saying/doing and how she became an entirely different person... But things got really bad when I ran into her with another guy & everything she said to me after that incident was just disgusting & cruel.

That guy turned out to be her new "BF" that she had been seeing before she even contacted me AND I just found out she did the same thing to another close friend of mine (throw herself at him than run away, she even said the same lines that she said to me).

So, because she destroyed a friendship of mine, cost me a job (not explaining that one) messed with the head of another one of my friends and countless other things... should I get revenge?

***there's more to this story about what she did but I've already typed enough.***