Just found out today that XH has got a girlfriend with 2 kids. He goes out of his way to avoid our 2 kids, doesn't have regular contact out of choice. Our kids just spent 2 nights with him, turns out they all went to the girlfriend's. Her daughter and our daughter made friends. A neighbour asked which was their favourite bit of Christmas, they replied "daddy's".
It really fucking stings. I do all the hard graft, I don't have time to date, I get all the shitty behaviour but their favourite time is there and they've made new friends and are excited. I want to cry.