I need advice on this

So I was in a friends with benefits relationship with this guy. As time passed we started to become extremely close as friends. Something happened with me and another guy and we decided to stop the benefits part of it, Yet out relationship grew stronger. But we ended up having sex again and then he told me he had sex with a girl he was talking to, I realized once he told me that I have feelings for him. We couldn’t have sex due to a personal thing I’m going through. We talk everyday and I know that he’s still seeing the other girl, and I act like I don’t care that he does, even give home advice about it, but I’m hurting each time I hear that he was with her. I don’t know if should tell him I have feelings or what to do. I don’t want to lose what we have and when we started talking we told each other we’re not looking for anything.