I've been trying to seek advice for this but have got little to no help with google (which is how I found these forms.).

I completely shut down when I am upset and it is upsetting my partner. We live together and when I get upset I completely shut down. I won't talk, move, I just kind of stare into space and be generally unresponsive.

This is how my outside reacts. On the inside I am screaming at myself to move or do something but it is like my body just won't react.
I want to talk to him about why I get upset but I can't. Its like my body won't let me.

He gets so mad when I won't respond but he just won't understand that I can't. I am so afraid that this could end our relationship and I don't want that to happen. I want to fix this.

I have trust issues and have also been physically abused in the past. I keep thinking this is a defense mechanism but I am not sure.

Most of the things that I get upset with him over is the fact that he won't tell me when things upset him. He wants "to make me happy" but I feel sometimes its at the price of him being happy. I have heard some of the complaints he has about me and I just don't understand why he won't come to me with them so I can fix them. I could never say this to him though. Like I said I just shut down.