I would suggest counseling. For him on his own, an you two together. It sounds like he has issues with needing to be wanted, and the attention is filling a void/need/addiction for him. I'm not a therapist, so I'm just throwing that out there. But one would be very helpful for both of you.
I would gather all this evidence for court. You & your kids deserve better. A sweet husband doesn't repeatedly cheat on his wife and a sweet father doesn't ruin his family. This isn't just one time or even twice to consider counseling. It's multiple, that you KNOW about. He knows what he's doing.
Sorry but I'm Confronting him And if Denys or can't tell me why: I'm Out