don't know if I can do this anymore 😔

He gets mad or upset over everything. 
-I took a bath with the door closed : must mean I'm mad at him.
- I watched TV in the living room rather than in our room: I must not want to be next to him.
- I didn't want to have sex because my back hurt (I'm 23 weeks pregnant) : must mean he can't please me and that I don't love him. 
Every day I do something wrong and terrible. I have  2.5 year old from a previous relationship and I feel like my boyfriend requires more of my attention than him and I refuse to be like that. (He cares for my son and would never intentionally be like that; is unintentional)
But I'm to the point I want to be done. I can't move without worrying if it will upset him or set him off. And his remarks about things. 😔 I've tried talking to him but he doesn't get it.Â