Did I do something wrong ? Is it my fault ?

So my s/o and I were talking on the phone. Then he muted me bc his brother was talking to him. Then I asked him why he muted me, and he acted as if he didn’t. So I was like ok🙄, then he kept talking to me acting like if I muted him but I didn’t I was talking back to him then he got mad and hung up? 🤔🤔 after that I messaged asking why he hung up, he didn’t answer so I called him and asked him. And he was coming @ me saying I muted him when I didn’t. Then he was like I couldn’t fucking hear you & I was like well I was talking to you.. then i told him something like “ saying something is different than doing it “ I totally forgot why I said that but anyways he was like “ okay I’m gonna cheat on you, saying is different than doing it “ so I was like okay .. have a nice night. “ and hung up 😭 then he messaged me “ maybe we shouldn’t be together “ this & that & then he started saying “ fucking fat bitch “ * I’m not even fat tho lol I’m a little chubby * , then “ big mountain ass nose bitch “ “ fuck you “ “ kys “ like i don’t get why he is like that... but the thing is he always comes back & apologizes but idk what to do he hurt me so much.. btw I’m 17.😭😭