Who knows what goes on in the mind of a MLCer? SA's answer is plausible. I also suspect that he is feeling very conflicted. If he woke enough to ask your forgiveness, he is beginning to 'get it' at least intermittently. But they are mosty angry with themselves, and they project it on to us, at least that is what I think happens. You walk in with your family, and he feels horrible, being there with OW. Moreover, he is in the wrong in every which way - with OW, not taking care of kids. Wrong footed on every level. That is when my ex used to be the meanest.
But the money could be any one of a number of reasons. However, I think any sign of generosity is a good thing. I wish my xh had a spark of it!! He is still in the wanting all he can get and then some, and feeling hard done by, I gather.