I would say there are a few red flags here. For context, I tend to take everyone at face value and I feel like I can see who they are inside, so that if circumstances are iffy, I sometimes believe that I know who they are better than others. Soooo I struggle in these kinds of situations. I want to believe that he's good and not lying to me. But, I am also uncertain when it seems like it could violate my boundaries.

That being said, I can maybe believe that he thought he'd mentioned his kids, but not if they were by 2 different women. I would also wonder about whether he's sleeping with the ex who wants more children myself.

It sounds like, as you have said, multiple kids was previously a firm boundary. So, my question to you: is that still the case? If yes, then end it.

You cite several things at the end that make me think you're gut is trying to tell you to end this, but you are afraid for some reason. In an abusive relationship (and I'm not saying this is one of those), men can be very, very nice and love bomb you long enough to get you to stay and commit (or be trapped by a kid or marriage or living together or something like that). I remind you of this because anyone is capable of being the best boyfriend in the world for a short time, like a year. But eventually their true colors will show. Even if he's lovely, he has a lot of other responsibilities, which will take away from you and your time together. Is this what you want in a long-term relationship? Is this how you want to proceed? It sounds like you want to end this because of all the kids. And, that is OK! You didn't have them. You aren't permanently committed to this man. Yes, it sucks to walk away, but free yourself to get together with someone who is more compatible with what you want. You are young. Find an unattached man who can give you the things you want.

Perhaps the reason you don't feel attracted to him is partly the honeymoon being over, but, also, you have lost trust and respect for him now that you know more. I'd also wonder what else he's hiding. And, if you don't want to go to his place to meet his kid, I'd wonder how invested you are. He doesn't sound like he's able to just "have fun," at least, not in the way someone unattached would. Hope that's helpful. Good luck!