Demanding money?!

So my daughters father doesn’t pay for anything for our daughter. We’re supposed to pay every other week for daycare but his mom pays for his weeks when it’s due or he will make the payment so late that I’ve had to pay it anyway so they will continue to watch our daughter. I pay for her health insurance. I pay for all the medical bills we get. I pay to buy her school supplies, new clothes, shoes etc. Despite the fact he doesn’t support her financially, I do not keep her from seeing him as I don’t believe in that (unless child is in danger of course)

Before we split up, we had purchased a house a truck and a vehicle for me together. I had to literally repo the truck from him as he wasn’t making payments and when I took it back the tranny was stuck in 4th gear and the power steering pump was toast. I had to replace all that. I also had to pay the sales tax and licensing fees for the truck (as he NEVER did it even after owning it for over a year). I paid $1296 the day I took it to get the payments caught up. It was a $30k truck so I paid over another $2k for licensing, sales tax and late fees. This was all JUST to get rid of it because I couldn’t sell it without getting the title legal. Sigh. So I also had him sign a quit claim deed on the house (as he stated he didn’t want the house so I stayed) and the quit claim deed stated he had no interest in the property - meaning I didn’t need his signature to sell it and he had no right the any money made from the sale. I’ve managed to get rid of the truck and sell the house and the LAST thing tying us together that way is my car which I was trying to trade in and he was ALL FOR signing the title and paperwork at the dealership. Until he found out that my boyfriend (who I’ve been with over a year) picked my daughter up from daycare because I was on PTO and her daycare is 30 mins away (I work in the city so it’s on the way). So he threw a HUGE fit and is now telling me that he’s not signing shit until I give him $8,000 he believes he has a right to…. Wtf do I do?! He thinks he has a right to half the money from selling the house (which was spent towards getting the truck caught up and sold so I didn’t even see that money either) and he thinks I need to give him half the stimulus money I got for our daughter as well… even though he literally pays for nothing for her? Am I wrong to not give him that money? If he was paying his half of the responsibility for our kid then I would absolutely split the money. But why should I now just because you’re threatening me and saying you won’t sign for me to get rid of the LAST THING holding us financially together?!?! He was so controlling and abusive the 5 years we were together. He is STILL controlling and manipulating me 2 years later after we’ve been split up. My car is the last thing he feels he holds power over me for. I feel so defeated and lost on what I can do.