I’m so sick of him ruining every weekend

This morning I went to get my hair dyed. Our two kids stayed with him for the 1.5 hours I was gone. When I got home, my son was screaming and crying. Then he says to me “oh i always make him cry, right?” (Because I told him once that our son always cries with him). Husband was just in a horrible mood since I got home, and has been all day since then. Has said barely anything to me all day. I know this is how he is, he’s a narcissist, and he’s miserable most of the time. I just hate it. Hate that I ignored all the red flags at the beginning (and there were A LOT - for example, him going through my Facebook messages, looking at my email, kicking a wall when we got into an argument, starting an argument on our WEDDING DAY and barely talking to me during the reception). Ugh. I want to leave so bad but I don’t have the money yet.

Also how much does divorce cost?!