Moving out, my ex is complaining the enitre time

So I've been leaving him for the last 2 years. I was looking - and not finding - an apartment and he kept begging me for chances and opportunities.

We've always struggled financially because he doesn't take any responsibility. We both had a really good income and ended up broke at the end of every month.

FOR YEARS I pleaded, begged and cried, I made him tables and charts and graphics to show what we were doing and spending and what we could have been saving if we were sensible.

He was always telling me that we're good and going forward and things are looking up and he doesn't understand why I'm being so stressed because he's never been better.

So 2 years ago I seperated my finances, and he was DEAD, he called me every name in the book, called me financial cheater and I was going to leave him because I was definitely cheating on someone because I am too weak to make that decision for myself. So I stopped trying to prove myself. I was so checked out.

So anyways, I found an apartment and I have been moving out. He's struggling, I'm not even out of the house and he's short 5k according to himself. His car needs new tires and his ex is demanding money from him and his son is needing a medical treatment.. He's blaming me but I don't see how any of that is my financial responsibility. I also do not have 5k myself, I used the 400 I had spare - after paying the down-payment of 3 months rent, my new rent of February and half of his rent for February - for some furniture and a few mattresses for me and our son. Not only that but this hasn't been news to him, he knew I was looking for a place, he just didn't think I'd get it that soon and he thought he could win me back so I wouldn't leave, so he didn't take any steps to make his bill lighter until after my lease was signed (which was a week after I notified him of finding the place and I was in agreement with the owner)

He's just slacking massively.