Do I have "screw me over" written on my forehead?

Ever feel like you have something written on your head that only others can see? That's how I've felt lately. I was dating a guy at the end of the summer-I believe I did a post about him-and he promised not to leave me, especially for this girl from our past.....and yet, he did. Boy was I hurt. Of all the guys, I never thought he would hurt me like that again! Then in November, I decide to enter the dating world again and started dating this guy, who I thought was the perfect guy for me. We had both been screwed over so much in the past. We had both been hurt so much by others, that I really never saw it coming when he told me he was still in love with his ex. My blood began to boil and I basically went off on him, telling him that she wasn't here-I was! He took a few days and decided that he wanted to continue to date me and that he wasn't going to let her stop him from the chance of finding love again. Yet a week and a half later he tells me that he isn't sure he wants to be with me because he still is in love with her. Seriously?!?! It seems like every relationship from my past has ended in similar ways, where I get walked all over. My ex-husband just decided he didn't want to be married or have a family anymore (of course I come to find out that he had an affair with an 18 year old). My ex-fiance and I split after I discovered he was talking to an ex-girlfriend and making plans to see her (tho he said that's not cheating). And the list goes on and on..... So, I am wondering am I ever going to find happiness or is it always going to end in me being used and abused?