Very frustrated now...

After my boyfriend of almost 2 yrs yelled at me for not hearing something he said the first time during working in college lab together (I was focused and doing math calculations), we got into a small disagreement. After nicely asking why he was so mad (because I didn't understand) he blew up saying I didn't contribute to the work and was lazy.

I got upset after all the accusations and harsh words he said to me and said that I didn't appreciate how he was talking to me. He says that it's just the way he talks and if that concerns me I should reconsider dating him. He continues accusing me of always picking out his flaws (which I don't, I just let him know when my feelings are hurt), I always hold his mistakes at a diff standard, and I always think I'm the creme of the crop. To finish it off he says "Honestly, no other guys is going to put up with half the crap you do."

I'm tired of dealing with everytime he has an angry outburst because he can't control his anger. Everytime he says those things to me I feel so sad and down about myself. I'm afraid to break up with him because it's been 2 yrs and I know he's just going to become offensive and throw something right back at me.

Sorry this is long, but I just can't deal with it any longer... kind words or advice is appreciated