Poisonous relationship?

My fiance and I have been together 5 years (engaged since March). He is so controlling the last year and angry at the world. He can be sat there watching a programme and he’ll make comments like, “her voice is so annoying dont you just want to stab her”… etc. we’ve had arguments where he’s thrown a bouquet of flowers on the floor (out of vase) and he’s thrown my phone smashing the screen. The other week he went through my phone (even though I’ve never given him reason not to trust me and I’ve never known his password to his phone) he saw I’d googled p*rn a week before and was enraged. Saying I’m disrespectful and kept my phone for the evening as he bought it for me he told me “you can have it back when I can trust you. It’s my phone anyway”. He got angry seeing i had sent a text to a male I work with (talking about work) but his issue was that I’d sent a kiss on the end of the text.. I had baked some oat bars for my son and when they were cooling down he came in, chucked them in sink, ran the water over them then chucked them onto the floor and just watched me clean it up in tears. We went to turkey in August and one day I wore cycling shorts with an oversized T and he said “you look like a slut can you go change”…I never did as I stood my ground. He doesn’t have a job atm, lost it few months ago and due to start new job in November. He looks after our 1 yo whilst I’m at work all week. I come home to the house a mess and his excuse is “I’ve been busy watching our daughter”. Like how does he think I manage to clean the house or when I was on maternity and got it done? He doesn’t pay towards house bills/food shops etc atm as he has no income so I’m really struggling paying on my own. He doesn’t get along with my son from previous relationship (8yo with autism and adhd) and once he argued with him and called him a d*ckhead. I just don’t know who this man is anymore and know I should leave but I’m scared to be a single mum again and now to 2 different dads. Who is going to want me in the future with 2 kids? Do I leave? Do I wait and see if things change? The amount of conversations I’ve had with him about being unhappy is countless and I don’t know anymore. I don’t feel myself. I feel sad, lonely and isolated. I feel like I’m walking on egg shells around him, waiting for him to explode about something so tiny. My 8 yo even though they don’t get along, always asks are you going to break up? I don’t want you to… I don’t want to upset him even though he doesn’t have a great bond with him anyway. I’m just at a loss. I don’t know the point in this post and know peoples reactions are going to be, “duh, leave”… but I don’t know. I just wanted to get it off my chest. Can’t speak to friends or family about it as I don’t want them knowing. 💔