My boyfriend (21 m) can't seem to respect my (21 f) boundaries

Tldr: My bf smacked a girls booty and wont respect my boundaries but I live with him we have been together 3 years and have no current income- I'm not sure if I should try to work it out or leave

I'm having issues with my boyfriend. He is doing things that I've told him im uncomfortable with and crosses my boundaries -but we live together and I recently quit my job idk what to do-

Here's a little context

Me (21 ftm) and my boyfriend (21 m) have had issues in the past where he has cheated and watched corn and stuff but that was years ago and I thought we had worked thru it- Recently I caught him watching p*rn in the other room while I was home. it made me upset because I had Clearly stated before that is something I'm not comfortable with but he kind of just brushes it off so I tried to just get over it but yesterday he really upset me. We went out with a friend (that he used to like but she friendzoned him)and he just seemed like his attention was all over her playfully hitting eachother ect he made a joke about smacking her butt I told him dont do that I'm not okay with that and he did anyways ? He acts like im overacting whenever I say im upset about it . Any advice is appreciated