Why is she still on my mind?

nc2386
Today is my ex-girlfriend's birthday. She broke up with me right before New Year's Eve. I soon found out that she started seeing another guy right after our break-up. It's tough because the guy is older, owns a restaurant and is just more successful in life right now. My ex kept trying to send me random friendly messages and "I'm still thinking about you" texts up until a month ago, when I cut off communication with her. I saw today that she posted a romantic birthday message on her new boyfriend's wall (he has the same birthday as her). It just sucks that I'm still stuck on her while she's been so able to move on. I've tried everything to forget about her and she still is on my mind. Is there hope left that I'll get better? Is this just a rebound relationship with this guy? Or will it last?
Why is she still on my mind?
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