How do I convince my ex girlfriend to get back with me?

I broke up with my ex like 2 to 3 months ago. Now she has a boyfriend and they been going out for almost a month now. But just recently I realized how much I love and miss the girl so now I want her back. Every time I try to talk to her she keeps the conversation short and brief. The other day I told her I miss her and ask her did she miss me and she said why am I asking her that when she has a boyfriend and I told her I just wanted to know. I told her she didn't have to tell me if she didn't want to so then she says well I'm not telling you then and says gotta go, sorry bye. I talk to a friend of hers the other day and she told me my ex was asking about me, she was asking what happen to the girl I was talking to for a little while. I think my ex found this out by going on my Facebook and looking at my profile. I just want it to be me and her again.
How do I convince my ex girlfriend to get back with me?
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