What should I do? My boyfriend doesn’t respect me

So my boyfriend and I have been together for 7 months now. He’s 36 (soon to be 37 in a week) and I am 23. Beginning of our relationship, he treated me decently good and I was okay with that because he was making time for us. Now all he does is work all week and try to hang out with me once a week and during that time, all he wants is sex. Like he doesn’t even try to go to the park with me. I denied him sex when I saw that he’s not putting in effort anymore and he told me that if I don’t have sex with him he’s going to get it from other girls because there are so many girls that want to be with him. We argue all the time and this one time, my friend came to sleep over (female) and he basically said my friend and I got something romantic going on so he got mad and sent me a video of another girl twerking for him. After sending the video, he told me that I’m with my friend and he’s not getting attention so I should see what other girls are doing for him(mind you he was working at that time ).

There has been some occasions whereby his ex will come to our house to cause drama because my boyfriends son who is not the ex biological child is living with the ex sister. Mainly because I’m in school ( and I can’t take care of the child ) I told him to Get a nanny but he said he doesn’t feel comfortable with anyone so the ex keeps on bringing the son to the house just to cause drama and It’s like he likes it. I don’t even know what to do.