<human>: Give me the gist of the text in a nutshell

To begin, my ex-girlfriend broke up with me just over a year ago. I didn't take it well, I was head over heels in love with this girl and thought it would never end. I have come a long way and can now see her (we go to the same college) without any feelings of sadness. 

I just recently found out that she has a new boyfriend, whom she cheats on regularly. She also treats her sisters like crap, once even almost hooking up with her sister's current boyfriend. When I knew her a year ago she was a completely different person than she is now, soft spoken kind of shy, would never dream of doing things like this.

Once I found out how much she has changed a thought went through my head, "I'm glad she's a bitch now", the reasoning behind this might be flawed but here it is. 

I took her virginity, I was her first serious relationship, I treated her like a princess, the only bad thing she did to me was break up with me.  Now she is a bitch to almost everyone, is a cheater, and sleeps around, quite a bit, from my understanding (from mutual friends). I feel like a dodged a bullet and got out before it could have gotten a lot worse for me, emotionally. 

Most people would hate the fact that their ex is sleeping around with numerous people. In my opinion, the only person she is hurting is herself, and I feel glad I got out when I did. She did me a favor.
<bot>: My ex is a cheating bitch (mutual friends' words) now and I'm glad because I get to just sit back and watch her destroy her personal relationships.