How do you get over someone who is over you?

[Halalal]

So about a year ago I started dating this guy. He was my first and he was amazing at first. One month into our relationship I found out he started dating his ex girlfriend again. So he pretty much was dating two girls. When I confronted him he said he didn't know who he wanted but all in reality he wanted to be with his ex girlfriend. He never made our relationship public and he would get mad if I posted things our his fb wall. so three weeks after we broke up he started posting pictures of him & and his gf and he had cute fb statuses about her. I WAS HEARTBROKEN, I felt unworthy. I felt like I wasn't good enough. I cried all the time. I felt used. I felt like a rebound chick. So in July, he called me four months later saying he wanted to "hang" out. So I went to his house and STUPID ME I had sex with him again. He told me he wasn't seeing his gf anymore and that she's crazy and that he misses me a lot. The sex was so different this time around. It was painful and rough and after sex he told me I'll never find someone cuter than him and someone who would F**k me this well. After going to meet up with him we talked for two days and then he just stopped calling and texting me and we haven't spoke since. It's been six months. I went on his twitter a few months ago and found him and his ex are back together. NO SURPRISE THERE!In my mind I thought I was over him so I started dating another man (who has always been my crush) we've been dating for two months now. But I still think about my ex and I still want him back! stupid of me right? I don't know why! I want to be over him already! it's about to be a year. I know for a fact he's over me Clearly but UGH.