Why is my ex upset that I don't want to talk or be friends?

jambibambi
My ex ended our relationship two months ago and got a new boyfriend two weeks later. We didn't speak for a month or so and once we became friends I had to find out she had this boyfriend. While she ans I were together she would always talk to this guy and at times I got jealous. When I found out she chose this guy over me I was crushed and being friends was too hard to do as it really hurts to see how easily replaced I was. After ignoring my ex for a while she broke the silence and talked to me about a movie I told her I saw weeks ago. She said she really liked the film too and tried to make normal conversation. The next day she tweeted that you can't save someone once they're gone, and how upset she was that we weren't talking or having a friendship. Can someone explain this to me? I don't feel there's anything there with her since she more or less broke my heart, and I think by now she should have figured that out. It feels like she's just being selfish.
Why is my ex upset that I don't want to talk or be friends?
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