Search Results: how do i get my ex to leave his girlfriend

Should I take my ex back after he left me in the first place for his ex? Or should I just leave it alone and stay single?
Well... My ex left me for his ex girlfriend and now he wants me back. Let me start by saying that I'm only 22 years old but I'm very mature and I am looking for very serious relationships, not casual dating. We dated for about 6 months but we've lnown one another for about four years (we were on the same college track team). The last month of us things got a little rough between us and but we decided wed work things out. Two days later he text me saying that he just wanted to be friends. Me being me I simply said okay but I feel like you're leavinf me for another girl. Come to find out he left me for his ex girlfriend. And the entire time we were dating he constantly claimed that he had unfinished business with her (whatever that means). I saw that it was over between us, and when I see that in a relationship just cut the guy of iut my life and move one. Well he came back two months later wanting to apologize and get back together. I forgave him but didn't want to be friends. But we kept talking after that and now we may be trying to work it out. I have a lot of self respect for myself so that's not an issue. But I have zero trust in him now and I want stability in my life. I also don't want to worry if he will leave me again.

So i've been dating this guy for about 2 or 3 weeks and even before we started dating his ex kept saying things. (he had been broken up with his girlfriend for about a week when we got together). She kept saying mean things about me and saying that me and him aren't going to last. The girl claimed that I told her I didn't really like him, even though i have never talked to her in my life. She keeps trying to get back together with him, and he usually tells me when she does this and then always assures me that he loves me and doesn't want her back. But she kept texting him, and to get her to stop, he said that he could see them getting back together. But he didn't tell me himself and I had to find out from my best friend who had been told by his ex. She asked him about it and he said he only said that he only said it so she would leave him alone. I don't know if i should believe that or not because i don't see how that would help get her to leave him alone. Help?