Bro, I've been there. I hacked a gf's password, I just didn't find 100% proof of cheating like you did though. I know it hurts, but she is your ex, so she doesn't need to be faithful to you. For the future, just understand that she is not going to be honest with you about other men and sex.
If you tell her you hacked her password, she'll use that against you, tell everyone you know, then lie about banging another guy to everyone. You'll be the big villian and she'll come out on top. Your proof will be called lies by her.
You're in a no-win situation. You've lost the girl, you've lost trust, you've lost friendship (in my book at least), she probably won't even fcuk you next time you meet up, plus, she's banging other guys without condoms! She has shown her true colors :cheer:
CUT HER OUT OF YOUR LIFE COMPLETELY TO GET HER OFF YOUR MIND! Block her from your myspace and delete her from your myspace 'favorites'. Don't take her calls.
Also, don't go crying to everyone you know about this. Keep it confined to maybe one or two close friends - keep co-workers and anyone who will listen out of it
lol I had to tell everyone about my misery - don't do what I did!!!