How do I begin healing myself?

A while back I met this girl who I really loved. She was perfect (at the time.) When we finally became official, she told me that now that we were official, she would become distant because now she could focus on other things. Well, she began flirting with other guys, getting their numbers, getting rides from school from them, and things did not really go well. She knew I had trust issues from being cheated on by other girls in the past, and she said she wanted to help me through it. But her flirting was so bad it did nothing but make things worse. She'd even check guys out (whose numbers she'd gotten) in front of me. She would always own up to her mistakes, so I know she wasn't a cheater. But when she agreed to work on her flirtatiousness, she broke up with me a few weeks after because she felt like she was "changing herself too much." After being friends for a while, she would be really moody and bitchy to me after all I'd do is be nice, and finally I told her off. Now, we aren't friends. Worst part is, she admitted to being mad at me and not knowing why. She said, "I dont know why, but I just want to yell at you. But just let it go. I'll come around (as in be my friend) in a while."