I was in a relationship with someone who sounds very much like your boyfriend. The rushing to judgement about you breaking up with him when you didn't and then twisting things to make it seem like it was because of your health issue just about triggered my ptsd.
This man you are in a relationship with will not change. Things may be different from time to time, but he isn't changing. And the lows will get lower. It doesn't matter how much you love him. Would you treat someone you love they way he treats you? You deserve respect and love and compassion. If he can't give you those things now when you need them, when will he?