Sorry its a long one 🙄

I ummed and arred about posting this but I need some advice. I've been with my partner for 6 years this year, I have a son from a previous relationship whos 7 and I'm 15 weeks pregnant.. Ever since finding out I was pregnant, he has been a total cockend. He said some pretty awful things to me at the start but I put that down to him being scared about me miscarrying again, which he later told me thats why. in short he told me he didnt want the baby and told me how he could just walk away. All forgotten and then the day before my 12 week scan, he went out with work mates and hid it from me, preplanned to go out and purposely lied to me. 😑 I ended up kicking him out for a few days and sorted it out but felt betrayed. He then was ment to be watching my son while I was at work but never came home that night so when I woke for work in the morning he wasnt there and I had to ask my parents to watch him.. (baring in mind they usually do on a weekend day if I'm at work but he broke his wrist on his night out and was off work so he could actually look after my son for the day for once).. he had fallen asleep at a mates all night apparently. So we sorted it and hes seemingly been fine since until tonight and he decided to say some shit about my son after he was misbehaving which my son heard and it really upset him. So I asked my partner to apologise and he basically said, truth hurts. I lost my shit and I just don't know if I can carry on this relationship after all the shit hes put me through and now hes really hurt my little boy.. We haven't had a perfect relationship and I've put up with a lot of shit from him but now because I've stood up to him He doesnt like it, called me a dominating bitch because I told him I didnt like how he spoke to me or about my son, he needs to respect me and my boy and he wont get away with his shit anymore. I love him to pieces but I just don't know if I can do this anymore, Im fed up of the lies and the promises of I'll change.