I hate sex and feel broken

Hello, ive been in a relationship for almost 6 years and we have 2 year old twins. I have 0 interest in sex and the last session was a little over a month ago and i cried at the end because I didnt want to do it. Our relationship has been traumatizing. I believe he could be a narcissist. He's called me out my name countless times, pushed me, just toxic behavior and I don't feel mentally or emotionally connected at all. He tries to make me feel calm by massaging my feet or being nice but I feel like he does everything for sex. We have a house together and hes backed off asking me but this morning he did and I just cant get in the mood. It made me feel low and I cried for feeling bad about never wanting sex. I kind of wish he would find someone else to have sex with so i wouldn't have to because I dont know if I'll ever want to because our relationship issues are never resoved. Idk, i just feel at a loss. I know its logical for me to nit desire this man but I hate that I feel stuck. I feel like im in HELL and the girls and I need a place to stay, I cant just end it because he'll make things hard for me while i try getting myself together. I feel like my life is a tragedy 😔