What do I do about this pregnancy?

About 2 years ago, I met who I thought was the love of my life, and then 8 months later I found out that he was sleeping with Sarah–my worst nightmare. We stayed together and they stopped talking and we got engaged, but I guess I never fully got over it cause I treated him like he meant nothing to me, and we broke up– 6 months later I grew up and I realized that I still loved him and fully only wanted to be with him, (he at first didn’t want to talk to me cause we had a horrible breakup) we met and talked and I completely fell for him again, only to find out that he is now dating Sarah, the whole time he tells me that they are breaking up and that he still loves me and we start sleeping together again (I’m usually not into other women’s men but I kinda thought she deserved cause she knew we were together, and he made me feel like it was soon over with them). Then the happiest day of my life came he told me they broke up– a week later I found out the complete opposite and that also that she knew that we had secretly been seeing eachother and SHE IS PREGNANT!! I thought no big deal just walk away, then the truth reveals itself that I am also pregnant– now I’m debating if I should keep the child cause she doesn’;t want him talking to me and he can’t even talk to me about the situation face to face, and he says that he cares about me and that he wasn’t just using me, but now he tells me that he is in love with her and that I really mean nothing cause I turned my back on him and he turned his back on her once and he don’t want to do that again, he says that he doesn’t want to see both relationships go wrong, and he doesn’t think that the way he is doing me is wrong!!! Please give advise, I know he wouldn’t be there for the child but I don’t want to get rid of it but I don’t want any ties to him either, I want to be rid of him, but I don’t believe in abortion or adoption– Pleas anyone that has any clue to this help!!!!!