My husband is a narcissist ....and a cheater

I’m in a super toxic relationship, married for a year now...I don’t even know where to begin only that I’ve never met someone so controlling, manipulative and narcissistic in my life...I feel so stuck and don’t know how to get out of this on again off again marriage. Every time we argue he literally is gone for a week or two straight it let o come back and tell me he’s slept with someone else but it was “okay because were broken up” how do you break up when you’re married?? He goes on tinder meets up with women, it’s almost like he starts these fights just to run off...He’s accusing me of all these crazy things when we’re together EX: “you bought a separate phone behind my back and hiding it” EX2 “you’re deleting clips off the recordings from the cameras in the house to sneak around” EX3 you’re deleting messages off your phone...none of this is true at all and he’s so set on believing that I’m doing these things when I’m not. Super paranoid,

Our latest argument started when he came over in the morning to have sex and I could taste “good head” on his dick even tho we hadn’t slept together in 3 days...he lied and told me he jerked off with the good head before I came home...who comes over for sex and jerks off an hour before I get there. And it didn’t taste new...it tasted like it was used like the day or two prior (not fresh) and he showered afterwards or something...he’s cheating. Period. I’m also 6 months pregnant with our son....I know it I just feel it. I bought cameras for the house (700$) to monitor my kids and he installed them for me but put everything on his email so when he got mad at me he literally kicked me off my own cameras in my own house!!! (We don’t live together) so he had access to all the cameras in my house that I paid for just to spy on me!!! I need to know how to exit this toxic marriage. I will post a few messages he sends me while he’s drunk texting me... please this is very sensitive subject for me don’t send rude comments I’m just looking for support and tips...