I have a serious problem and need advice

So basically the guy I’m with has two kids with someone else, I have one kids with him, one kids from a previous and now we have a daughter I’m currently pregnant with....so one of his kids with the other girl has major issues, doesn’t listen, touches my older daughter inappropriately after being corrected a million times, my 3 year old son with him doesn’t like him and is bullied by him, (this one kid is 5) and is rude, messy, just everything that I’m not equipped to deal with. When I go to their father with issues he tells me to fuck off and tells me to leave and move out or just doesn’t fix issues and expects me to deal with it....he gets on to him only if HE SEES IT, the kid apparently was just diagnosed with ADHD, and a form of autism where he doesn’t think before he acts but it just seems like an excuse to feel sorry for him which I DONT, the kid just acts like there is no authority or consequences in his life or actions, I’m legit high risk pregnancy and when he’s around I just want to leave but that again causes issues because then I’m talked to like shit just because I’m not around his kids...it’s affecting me and this baby (his first daughter) and I also don’t like that my older daughter from a previous is getting touched and being told nasty things by this creepy kid...I keep telling the dad once schools out Ill just leave and move back in with my parents since he won’t wake up and can just easily throw me , my daughter and my two kids away like trash over his other kids, he laughs at me like a joke (I left him in the past for how this kid acted but the kid was younger that upon many other issues due to social media and other things) but this time it’s almost as if I’m left not choice from the stress...idk what to say to him for him to not attack me about it... I wrote this to him and thought about sending it via text since when we talked face to face it doesn’t seem to process or he just simply doesn’t care but I wrote this and any other advice on what I should do or say would be highly appreciated! Just need an ear because I literally have no one to talk to and I’m at the end of my rope...especially this last weekend his kids were here and he kicked me out over me telling him to make him stop bullying our kid together , thank you!

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I’m going to address something for the last time that’s been bothering me and that will make or break us, you take me as a joke but we both know I have no issue walking away so let’s act like adults for a change...

I’m high risk pregnancy (you know this) and something could happen to me at anytime, I am coming to you with something that’s not being resolved, and you aren’t compassionate towards me or this baby that it’s affecting (who it’s affecting now and when she will be born) then I’ll have this little girl and her around the issues

And this pains me because I want you to enjoy your daughter and be around her daily but if these keep up the way they are it’s either I’ll have to leave every time Liam is around on weekends (since nothing is changing no matter what and when he’s around you legit throw me away like trash and make me do everything even your mom does not want to deal with it) or I’ll be stepping forward to moving out at the end out May,

If you want to lose me again permanently because this time it will be that way, then continue to keep things how they are and not fix it and not be on my side as a team...clearly you don’t know how to handle it either and don’t think about me or any of the other kids it’s affecting, you don’t even care about Zion being bullied or that my Nevaeh keeps getting touched sexually which is basically being molested, I wish you’d open your eyes!

I’m not equipped to handle him and this child is out my league to handle and you don’t respect it when I come to you and say things about the issues and you attack me or against me it’s just not right especially if we are supposed to be a team, you allow kids to come in between us and turn against me, I have to fear saying anything to you and suffer in silence and it’s bringing me down into a depression and making me resent you.

We are both pushing 30 years old and you rather throw me , Nevaeh, Zion and now irie away over this, that says a lot...this upon many other issues with us; you already don’t act like we are together on social media which pains me...but I wouldn’t be coming to you if I truly didn’t see issues...

I’m doing this for my health and for the baby , and for everyone’s sanity...and if you can’t understand any of this...then I have no choice but to leave permanently and us live our lives apart again, simple as that. “