why can't I do anything right

Today has been a good day. Me and my boyfriend went to his moms to help her do some moving and she was giving us some things too. Well after the end of the day, two new couches in the living room, it seems like things have changed with him in just matter of an hour.I just feel like I can do anything right anymore, much less say anything right. It never fails, it can be a good day and I say one word and everything will change. It makes me wonder why do I even say anything half the time around him. He acts like I said something major and I let him say what he wants to say but when I try to say something he don't want to hear what I have to say. That really drives me crazy to the point that I just want to choke him. I am finding myself wondering if he is looking for a way out of the relationship.