Hm. With hindsight, I think that's probably a large part of why my pet agp has been in a holding pattern for several years.
When I was pregnant, he was terrified of having a son, because he didn't know how to be a father to a son, because his own father cocked up so very badly in so many ways (and still does). So he tried to emulate his mother instead - but his mother's usual behaviour protocols were conditioned by his father being the absolute arse that everyone had to revolve around.
When our DD was a few months old, he admitted to me that the love-feeling he was expected to feel wasn't really there yet and it scared him. I told him it was the same for me, and I was very blunt about the fact that, if she ever picked up on her father not loving her it would mess her right up, just as it had him, so he was bloody well going to fake it until he makes it. So he did. And now he loves her fiercely, and (with a bit of encouragement) will push out of his comfort zone and do new things with her, because he understands it's good for her development and their bond.
So he hasn't had to send his midlife crisis out into a weird sexual direction in order to feel like he's still in control of his life - which means my midlife crisis isn't going to be spiralling down in a desperate attempt to protect our daughter from him.
Hmmm.
social, talk to the kids. Talk to them about how it makes you feel, in your body and your mind, when their dad behaves in certain ways. Don't make it a matter of blame, don't make definitive statements about what's happening in his head; just give them space to feel their feelings and get them out in words that make sense to them - and you have to lead the way by showing them it's okay for them to do that, by doing it first. Otherwise, when they hit a point where the feelings get too much and they can't express them healthily, they break down in their own ways.
Obviously that's easier said than done when there's this much stress going on! But it's best for the kids, isn't it? They have to learn that it's okay to feel and it's okay to express it, and they have to know it's safe to do that.