Let me give you an insight into facilitating contact with a dead beat Dad, which is what he's proven himself to be to date.
I dated a guy whose neighbour was a single Mum with a deadbeat father for her kids. The Dad was due to take the son to a football match on a coach with lots of people from their small town. The son was excited about it for months beforehand. He was dressed and ready for the coach, the Dad let the Mum know he wasn't turning up, with some excuse.
The excuses was BS. His life, latest gf, sex life, drinking etc was his priority.
The Mum had other younger kids and couldn't take the boy on the coach to the match. It was too late to get to arrange someone else to take him, and he didn't want to go with someone else anyway.
He was the only one who didn't go to the match.
The Mum told my ex she spent hours trying to calm her devastated, upset, angry son down. Trying to prevent him from injuring himself by flailing, kicking and knocking his head off his bunk bed. She had to deal with this while trying to look after her younger child too.
That's a snap shot of life when you try to get dead beat shitty men to be Dads, even occasionally.
Don't worry about him, just try to get the money he owes you.
Incidentally the way he treated you, in a relationship of two years, was appalling too.