Do i leave?

My baby daddy says he loves me. And we have been together 10 months. But he admitted during the 3rd month that in the first month a girl sent him nudes which he sent to his best friend. This upset me so much. I ended up forgiving him. And now on the 10th month I find out he is talking to girls that he told me he wasn't. I looked on his history it showed her name (on fb which he talked to her on) then it showed that he deleted the whole conversation. But he claims he didn't delete hers. I don't need stress due to being pregnant. But do I believe him and move on with him or move on with someone else. I know its wrong but there is already this guy I've known for 4 years and he wants to be with me and has always treated girls with respect. Do I go to him or what? Please help.

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