Ex-boyfriend problems

Laleh

So recently my boyfriend and I broke up. We are still working on it because we still love each other very much. The thing is, he is talking with other girls when we are together and when we're not (probably). Sometimes I think I'm overreacting because we're not together anymore and he can do whatever he wants, but then when we talk and are together he tells me he loves me so much and all that. It's just confusing because when I ask him about those other girls he says nothing happened but I found out that the the girl he talks to used to send him nudes and that before he met me, he had feelings for her. And now I just don't know anymore. I'm confused... Somebody give any advice?