i have been in a bit relationship for almost 2 years now. at the very begining he was talking to his ex, lied to me mutiple times about it. he told me it was in a friends way, i seen the messages and it was. i finally found out a few months ago that he didnt have the heart to block her. over time and after he fully blocked her thats when he turned really toxic. it feels like he still has feelings for her, and hes always listening to songs about missing exs. idk maybe im being dramatic. any advice? im exhausted mentally and pyshically. he even treated her better when they were friends. hes always using my mental health against me and what ive been diagnosed with, saying im childish and i need to grow up ect.