I know it, I've been in almost the same situation, actually I still is, and it's hard. It's hard to get over a girl you really loved, and it's hard to hear her say these things about you. My ex did almost the same thing. I don't know if she has a bf now, I can't recognize her personallity anymore, she totally changed.
I can tell you what I've done so far, it isn't much but it works slowly, slowly I recover from the loss of my love. I still think alot about her, I still cry over her, it still do, and we broke up 1½ month ago.
To get over her, so far I've, worked like hell, 10 hours a day or something like that. I've talk to the most of my family about it, it didn't really help, but they all said the same thing, so they must be right. I actually got a new gf, she's very understanding and says "It's okay you still think alot about her, I understand and I can take it" but I don't love her, I have some feelings for her, not many, but some. And she knows that, I'm totally hournest about my feeling for her and my ex, but it's nice to have somebody that cares. It becomes better with time, but it takes time.
But don't wish bad things for your ex, I don't for my ex. I bet you had a great time with your ex, and if you have to think about you ex, think of the good times you two had. The good things is all that matters. Don't try to contact her, just makes things worse, let her contact you, and if she doesn't it's just too bad for HER