Tired of the disrespect

Ok so I have been with my mam for 5 years and in the first year his baby moms constantly disrespected me it got to the point we're I had to beat her ass because she spit in my face mind u I was just sitting in my truck minding my business when she did anyway the next year his 16 year old was talking crazy shit about me disrespecting me over and over I eventually let it go now we have his oldest living with us and I thought we had a close relationship but this hole time she's been going back to her mother and aunt talking crazy shit about me and on top of all this her aunt came to my job and flipped out on me because the oldest had to babysit my daughter for one hour so her aunt came to my job saying that that's not her sister she don't have to watch her all kinds of craziness in front of all my coworkers and customers and now I'm also 8 weeks pregnant with our child now I'm extremely tired of being disrespected I helped him fight for custody for his youngest I have treated all 3 of his kids like there my own and I feel extremely hurt now my man tells me to just deal with it I told him I'm not happy and I don't want to live here with her mind u she's 18 and has plenty of family but he said he won't tell her to leave so I have decided to start looking for a new place for me and my daughter to move to I love him to death but I can't take the disrespect and talking down on my daughter I want him to understand but he doesn't get it and I feel miserable all day because of this I have done everything for these kids and they are just so disrespectful I thought he would try to stop me seeing I'm having his child but its like he doesn't really care what should I do he don't even punish them or stick up for me really I'm starting to feel like my relationship is coming a end