Relationship issues?

Me and my girlfriend have been together for a few months, and even though we were careful she got pregnant, I was ecstatic and she was devastated because she already has a son and well we really aren't ready we both work but she has a hard time of it being on her own (we don't live together) and so she said she didn't want to keep it. I supported her in her decision because I feel like if it's her body I can't really stop her but I was really angry, so I went with her and all was said and done. Afterwards she stopped by unexpectedly one night and I had someone else in bed I don't know why I did it I think mostly because I was so mad at her, so we fought and she left , after she called and we talked and I told her how I felt about her getting rid of our child, now I'm hurt she doesn't trust me anymore I feel like everything is falling apart but I do love her what should I do? call it quits or try to work through it?