My boyfriends 7 year old son has caused us to break up

My boyfriend and I were in a relationship 14 years ago and had a child together. Things didn’t work out and we chose to part ways. He had another child with another woman that did not work out either. The woman is very jealous of our son together and has done NOTHING but wreak havoc on all of our lives for 8 years. She has gotten orders of protections and stalked every girlfriend he has had for 7 years. Pictures, phone calls, tracking apps on her son’s phone, and harassed. No exaggeration…cps, cops, constant controlling, blaming, fighting…anything she could do to our son to ruin his mental health…she’s done it to our son and boyfriend. Fast forward, we have been together and In a relationship for 9 months after 8 years of being separated. We get along great until it comes to his 7 year old. The 7 year constantly hits our 13 year old son in the privates, hits him with baseball bats, hockey sticks, lacrosse sticks, destroys his things, slaps him in the face, calls him fat, tells him he’s worthless, throws things at him, slashed the tires on his brand new bicycle I just bought last summer. Calls my disabled child (my 21 yr old son) a retard and tells him he stinks. Screams and flops like he’s dying if my son tries to defend himself to get his dad to yell at my 13 year old for defending himself. When this stuff occurs, I pack up and leave. Our 13 year old wouldn’t go with me until recently. The mother had it court ordered that the 7 year old is not to have any discipline, and his Dad (my boyfriend) says he has to follow this court order. So, his dad can not correct ANY of this behavior. So, I have been removing my 13 year old from the situation and having him stay with me. The 7 year old is completely happy with it and says to my son, “good, I don’t want you guys here. Go live with your mom.” “About time your mom takes you” just mean and vile things..,and my boyfriend does NOTHING. Help?! What should I do? They say “take time, give him space” but we have not spent any time together in about 2 months because I can’t keep subjecting myself, my disabled son, and our 13 year old to the physical and verbal abuse from a 7 year old. Help?! What do I do?