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Baby Daddy Drama

BD back and forth.. advice please

This is a LOOONG post, sorry in advance. I have been divorced from my ex husband for 3.5 years and have been with my current partner 2.5 years. For the first 2.5 years we were divorced, he basically left the kids and had saw them about 10 times and only 2 to 3 being overnight. In October of 2023 he got with a new woman. A month or so later he decided to be a father and kept them every other week until Feb 26th 2024.. which is when the paperwork went through to stop his child support and to edit the custody order legally require the week to week. The week after he requested that he only get them every other weekend.. I agreed. Shoot to May and he and his partner split up and I learn that she took all of our children's belongings and sold them out of anger towards him (she is who told me this). I tell her she doesn't need to be around the girls if she's willing to get rid of their clothing, toys etc and tell him if he's going to allow that I'll be keeping the girls. He doesn't argue this and I'm the main parent until August when I move away (yes I obtained a go ahead from him to move with them). I move and he asks for every other weekend which I agree to because it's been long enough and my girls want to see their dad.. this Friday will make the fourth visit.. 1st visit he refused to get them until the day he'd need to give them back because he wanted to go to a nascar race and then argued he only wanted my oldest. Second visit he handed them to a babysitter because he said he'd be too tired to take them to the babysitter before he went to work that morning.. they stayed the entire time with her. 3rd visit went fine. This visit he's cancelling on them for another nascar race.. on top of this he's financially contributed a whopping 200 since I started being primary in March. My oldest daughter bawls her eyes out every time she goes to him and comes back with an almost uncontrollable personality and her actions are absolutely terrible compared to when shes been with me a while. It takes a week to just get her leveled. I would love to gain full custody.. but I did not handle any of these situations in a proper way, especially his NOW fiance (they got back together) selling their belongings. I held a grudge for that and I know I shouldn't have.. What would YALL do in this situation.