After 3 years left for another guy after two months?

[Jsmoot33]

Me and my girlfriend were serious for 3 years. a couple of months ago I felt like she kept picking fights with me and was acting strange. She had gained a new group of friends which I was cool with because one of here insecurities was that she never felt like she had friends. A couple were guys but I'm not the jealous type I promised her it was ok. Eventually she broke up with me... Through text message. The next day she was in New York with one of these guys. A month ago I got a long text message begging for me back. I said I don't believe that door is closed forever but right now I think we both need time and the break up happened for a reason. She hasn't always been emotionally stable and I think she needs to find ways to make herself happy being in a healthy relationship. We scheduled a lunch last week to talk. She cancelled saying she was too heartbroken to see me. Today I found out that she put on facebook she is in a relationship with that guy. I haven't said anything to her and I am trying to handle this with class and dignity. But I'm just so hurt and angry. When will I stop feeling so angry and sad?