You were single parenting, plus taking care of a man who didn't want to be there to parent his kids or be a husband to his wife.
He was removed from the family because he emotionally didn't want to be there.
This is a story that sadly happens, and you know what they all have in common? Its somehow twisted around to be a womans fault.
She didn't have sex with me
(but worked full time, did all the housework, all the child rearing, cooking, shopping)
She made no effort to be attractive anymore
(If only there was a 25th hour in the day!)
She nagged
(Because he does nothing unless he's hounded, all responsibility lands on her shoulders whilst he doesn't even interact with his children)
I've been a single parent, and I've been married, the only difference is having one more person to take care of if he's that useless, it sounds like all he was bringing to the table was his sexual wants and grumpy attitude.
Ofcourse, a new woman is so exciting to him!
He can ride off into the sunset with this woman who wants to have sex with him, and accepts his lack of responsibility. He's all ears now, probably jumping to help her wherever he can to impress her....for now.
Honestly, the fact that he couldn't even interact with your kids is disgusting and you are well rid.
You kept things together when he couldn't be bothered.