Granny24 wtf ?
You think OP should sit it out , until when ? He hasn't forgot to take the bins out love , he's been shagging someone else, and refuses to end contact with her. He's not having a midlife crisis , he's a c@nt .
OP get legal advice, then get everything . You will be better off without him , financially & emotionally . I'd make the b'stard look his kids in the eye and tell them what he's been doing behind your back , and that he refuses to end contact with her .( the oldest ones , not the youngest ) .
Let the look of disgust from his children haunt him until his dying breath . Then you could casually remark that next time he sees the Ow he should remember the look on their faces , and that she is not a friend to do that to his children . And as low as she is to be mucking about with a married man , he's 10 times worse . If he has no respect for himself to act this way , his problem , but you and the kids deserve better than a lowlife cheating lying scumbag .
Ask him if the ow will find him so attractive when the csa and divorce has rung every last spare penny from his miserable lying pockets ... Remember that they have similar powers to customs and excise and can take driving licences and passports to non payers . My own soab-exh was kindly informed that he is looking at a prision sentence if he defaults on payments again !
It's New Year's Day . It's also the first day of your New Life . You will have a bit of a rough ride the next few weeks , but on the other end of it is a good happy life with lots of fun , laughter , new people , new friends , better situation for you and the kids . Freedom from all this rubbish you've been putting up with . Just put yourself first for a change , someone has too .