Advice needed on a cheating boyfriend!?

People make mistakes. He honestly seems like he truly feels bad, and he truly wants to make it up to you. He should have told you about it from the start, though. Just talk to him about it openly. It's good he's going through the effort to make you trust him again. I don't think you're stupid for trusting him, because like I said, people makes mistakes and he seems like he cares. I also don't think you're stupid for not breaking up with him, but if it happens again, I'd end it.