Ive been wih someone and have a child with them of 3months old. Everything has been going down hill since i?

was 8 months we have been living together up until a month ago. lies drama and mental and verbal abuse has been constant but we both contributed to the problems. some more than others but we cant even have one conversation without arguing and yelling, and its just been a big mess and im tired of being pive then getting the short end of the stick everytime and continuously be accused of lying and him promising things for our daughter and then when things doesnt happen it's my fault We both have alot to work on but stupid me i really love and want to work it out with him but its stressing me out to the point im breaking out headaches etc. he says i act to nonchalant aboout things and he knows i have another man. But im not telling him anything about what ive been doing and now he's like making things super hard for me. either he really loves me and is trying to uet me b'c hes hurt or ....?