He might be an amazing Dad, but he is not an amazing husband. He's not even "OK" as a husband. If he truely is an amazing Dad, he'll make being a NRP work.
Even if you think you might consider taking him back, he has to do a lot of changing first. The first step you can do to put him on that road is to tell him that you've thought about it, and the man he is right now, not sure if he loves you 'enough', still saying he loves another woman, completely confused about what he wants from life - is not a man you want. If he wants you back, then he has to convince you that your life will be better with him in it and he deserves you. The man making you play the "pick me dance" is not a man who deserves you.
Once he's changed, you'll think about it. But it's very important you tell him this weekend that "it's no longer your choice". He has to realise he's lost the power to keep all options open, and will have to fight to get the option of you back. If he does love you and this is some sort of mid-life-crisis fuckwittery, then that might be enough to shock him out of it.
If you take him back now, he'll always feel you are the lucky one that he picked you.
If you tell him he doesn't deserve you and make him work like mad to win you back (for at least half a year), then he'll feel like he was the lucky one that you gave him a second chance. Or he'll decide that he only wanted you if you were the easy option so not be all that fussed about you - and at least you know that his claims to love you were just him wanting a plan B.