Girl's Behavior

What do I do in this situation?

My ex and I broke up in January and two weeks after she told me she had a date, I got upset and she told me she didn't really have a date. We still talked and snapchatted this entire time for further reference. Middle of February she told me she went on a date with this guy I know. I came back from my friends bachelor party and called her. She tried to friend zone me and asked me why this guy ghosted her and I told her I was uncomfortable talking about it. We still talked everyday and snapchatted, hung out and hooked up. End of April, beginning of May I asked her if she wanted to hangout and she said she was seeing someone. It was the same guy. I first told her to never talk to me again and then I said that I saw they were liking each other's posts for some months, some months even when we were still together. She said I was being aggressive and to leave her alone and that he didn't come into the picture until February. I told her "yeah no problem don't ever talk to me again" I called her a couple days later and told her I didn't want to end things badly. I asked if she still wanted me in her life and she said it was up to me. Couple days go by and she still snaps me and texts me that I should get BSE tattooed with her name (best sex ever). I called her up and begged for her back and that I would fully commit to her by moving in and getting married at the courthouse the next day. She told me to move on and that I would find someone. She said this relationship is kind of serious but hasn't slept with him yet and that's why I'm still BSE. I said we were still kind of together and she said not at all. So in my eyes we just broke up completely while she monkey branches. She told my mom that they were going very very slow but said it was serious to me. Can't sleep, can't eat. 2 week of no contact. She going to concerts with guy and on dates to places we went. What is this new relationship? How do I stop stalking media? Will she come back? How do I move on? Still hurts
What do I do in this situation?
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