Should I leave him or not?

So here is the story...

Me and my bf, we started dating 4 months ago, and I didn't see him in any bad way or so. He was sweet and caring since time we met and we were friends for like almost a month. And each month we had big argument about something so stupid like him thinking im cheating because i got busy with school and then he started to say hurtful words to me and when ever we argued, he would tell me "please s**cide" or "i hate you b*tch", "You're a f*cking sl*t". Later after 3rd big fight he started to say whole time that I'm a cheater without having any evidence, saying I'm hiding something or that I'm being suspicious because of having unusually less time for him and not answering right away. I have a 1 year old brother at home that loves spending time with me which i don't have any problem with because i love kids (not in pedophilic way). Whole march we were arguing constantly because he had problems with everything I did even if it was little mistake. I would get blocked after he saying I'm a b*tch, after few hours he would unblock me and pretend like nothing happened which is kind of push and pull game. And i beared every word he told me but when i told him what hes doing which is threatening me by saying if he can't be with me that he will come and take me because he wants and if someone from my family members wanted to protect me he would k*ll them. What else i told him that hes doing is that hes being simply toxic and should work on himself instead of behaving that way. First i thought hes like that because of his abusive dad, like short temper and so but it never got better. He started having problems by me wearing not revealing at all clothes because he didn't like it that i wear tank tops to school because it shows too much skin, i said oke i wont wear them instead i will wear more covering clothes like oversized tshirts and hoodies. Suddenly it also became problem which i dont understand. Now 5 days ago he realized that he was toxic and that hes sorry, that he will change and so on just because i said im leaving because i dont want to go throu same thing again. I listened to his "we will get better", "i will treat you right" so many times and i believed it always because i deeply loved him but i got fooled by it because he then started to fight right after i said that i will stay. Whole time he would say its all my fault for mistakes i do because im apparently stupid even tho it aint my fault that he reacted such way, just because i said smth wrong doesnt mean its so bad that we gotta fight. He started to say then he wants to beat me up or that he wants to r*pe me even tho he knows i hate such stuff and i dont take it as joke. He started again to beg me to stay, saying hes crying and so but i dont really believe him and i dont know if he might be serious or not. I started to not know what im thinking or feeling when im with him which made me confused why it is like that until i googled about it and apparently its because my brain is trying to block me from getting more pain making me leave him and so on. Thats when i realized he is actually bad for me but at same time i feel guilty when he says hes crying and that he only loves me and so on. My best friend keeps on telling me for long now to leave him because hes bad but i never listened to him (he's gay so no worries, we know eachother for 4-5 years already cuz of school) because i loved my bf so much... I don't know what to do and i dont know if i should give him again a chance after this all shit or if i should actually end it with him and cut contact. I'd be grateful if someone could give few tips because it would help me a lot. Appreciate you for reading 🫶🏻.