You sound really angry and bitter about all of it. I mean, that’s fair. You can be angry until you’ve moved on but you have to leave your feelings out of it. I don’t think you’ll like my advice but it’s worth a shot - talk to the ex. Acknowledge the problems in the past and tell her you want to leave them behind. Tell her you want a closer relationship with kiddo and want to co parent with her to make sure kiddo gets the best from both of you. Acknowledge there’s not a lot of trust but you’ll work on it and prove that you deserve to be there for the kiddo. Don’t fight about money. Ask how you can help. Show up.