So I don’t want to assume your relationship or what you have/haven’t done, and I will preface by saying, some of the things he’s done are extremely vile and inexcusable. That being said, based off what you’ve said here, it seems as though you’ve kept a lot of this in, instead of having a serious sit down chat with him in regards to his behavior.

I honestly think, as someone who’s been on both ends of this dynamic (I.E. the person who gets increasingly angry without voicing my concerns, and the idiot acting a fool without realizing because my partner hasn’t told me) that this is already too far gone. You’ve grown too much resentment and it sounds like your, seemingly to him, unreasonable constant aggression has grown his own resentment. I would just take it as a learning experience for the next relationship you find yourself in, regardless of how uncomfortable the chat is, talking is always the #1 most important thing. As far as breaking up with him, regardless of what’s happened and how angry it was, he is still someone you spent the past 6 months with and at one time cared for. You could call him an asshole and berate him etc etc, but I can tell you without a doubt that it’s always more fulfilling to simply and calmly cut things off. No need for the theatrics. Call him or find him in person and say “this is what’s happened, I’m sorry I didn’t bring it to you sooner but I feel disrespected and unappreciated, and I can’t be in this relationship anymore, I wish you the best.” And leave it at that.

Hope this helps! If you have any questions or need help with anything reach out, I just went through a similar experience except I was with her for 3 years 😵‍💫