Confusing Partner

Hi all.. So Im 6 weeks exactly today, this pregnancy wasn't planned, I've been with my boyfriend for just over a year he's 22 and I'm almost 30 I already have 4 children who he is a great step dad too.

Recently when we discovered I was pregnant he was horrible didn't consider any of my feelings at all or ask what I wanted kept going on about abortion, two days later he apologiesed and was so happy about it even to the point of picking names we revealed to our mother's on mother's day and he was over the moon... A new week has begun and he has gone back to how we was on day one... Upstairs won't speak to me for two days is nasty and snaps at the kids (somthing he never does) then txts me(in the same house) telling me he's not happy I keep telling him to leave but he doesn't?!!! I feel so mistable and alone in my decision I don't know what to do 😭.... I feel its a loose loose situation I need some help. I don't want to keep and have him feel trapped, but then again I don't want to do somthing and regret it for my whole life and depress my own mental health 😭 I am in no way worried about being a single mum to five that's not why I have doubts the only doubts I have are purely based on him blaming me for either being trapped or then changing his mind saying I'm a murderer 💔 I'm so lost