What is wrong with my boyfriend?

My boyfriend has been acting weird lately... everyone has noticed it and asked me what is wrong with him and he won't even speak to me about it. It is like he is depressed all of the sudden. He gets so frustrated over the smallest things and then displaces his anger. For example, he always nags to me about having too many clothes and leaving them on the floor and he calls me a slob because of it. The other day i cleaned everything in our apartment, i even refolded all the clothes in the drawers and organized everything else. He comes home late from work because he says that when he comes home it reminds him of how much of a slob I am and that he can't take it anymore. I will admit I am not the cleanest person in the world and I never was (and we've been dating for 3 years and he's just saying something now but I've also become better at respecting his space). After having spent a few hours doing all of this housework, he doesn't even acknowledge it (not that I expect him to say anything) but he proceeds to STILL call me a slob! When there is not a spec of dust in the house! i think he is delusional or that he has a psychiatric problem because there is nothing sloppy about the house right now and he's still saying that he can't take my messiness right now. It is like he is looking for any reason in the world to be pissed off at me but they are so irrational and I truly believe that he feels that way though. I want to convince him to go to a psychologist (not only because of this but also because of his mood swings and displacing his anger all the time) but he will refuse to go because he is as stubborn as a mule. So my question is how do I convince him to go get help? He is the most depressing and negative person lately. He says all the time how I push him away when he tries to be intimate but its really him (he won't even give me a kiss when I leave for work). This whole situation is starting to get worse. He keeps blaming me for things that either he does or other people do. He displaces his anger for his parents onto me (not violently, he just picks me apart on how "worthless" I am to him at times). I love him so much and I know he loves me and he has never been like this. What could this possible be ? What could be wrong with him? Any psychologists out there???? I need help so desperately...