Boyfriend wants to continue threesomes with his friend

Hi. I’ve been in my relationship for 5 nearly 6 years and it is not a good one. It is often violent and I do a lot of things I never would’ve wanted to. He has begged me for years to have threesomes and we did have one before that didn’t work out well for us. He constantly yells at me about not having sex enough, me not being good enough at blowjobs and sex, and wanting other women. He told me he would leave me if we didn’t have another threesome and he made me create a tinder profile for us. We hadn’t found anyone on there and he began hinting to his friend who is “lesbian” about whether or not she has any interested friends. Since this he has been inviting her over regularly and planning days for us three like axe throwing and stuff like that. He never plans these things for just us. I don’t know what is wrong with me and why I haven’t left earlier. I’ve felt so emotionally stuck. This past weekend, however, he finally got her to have a threesome with us. He focused nearly all his attention on her and honestly neither of them really even touched me much. Watching him fuck her in front of me has absolutely devastated me and I haven’t been able to eat or really talk much. I’ve just been taking melatonin and sleeping. I truthfully feel so depressed from this. I don’t know what I’m posting on here hoping for, but I can’t tell anyone in my life about this and it’s eating me alive. I’m starting to feel like I might finally be ready to leave him, but he is on the lease of my apartment and I also financially depend on him a bit. I do have my own job, but it is barely enough to cover everything if it is even enough to cover everything. He has continued talking to her and they’ve pretty much just been sexting for three days straight. I’ve saw the messages (he doesn’t know that). He just keeps telling her how bad he wanted to eat her again, how bad he wants to punish her next time, and asking her for boob and ass pics. It’s killing me inside and I really don’t know what to do. The next morning he also yelled at me for “cock blocking” the next day and told me he wants to fuck her on his own too and that it’s not right of me to stop him from this because it’s not his fault he has a high sex drive.

If I leave him I don’t want him in the apartment with me, but he is on the lease and I can’t really move or I’ll lose my job. I have photos of bruises and such and was wondering if the police would still accept those if I reported it now and if he would have to leave? I feel like I need to save up and it is so hard for me to leave I don’t know what to do. I also basically have no friends and the friends I do have are ones I met through him I’m assuming I’ll lose.