Caught masturbating by roomate?

last night i thought i was alone in my apartment so i started to masturbate like any normal dude...the thing is i didnt realize that my roomate was in the living room cuz i thought he was still at work so he walked in my room in the moment that i was ...im very embarrased cuz i got caught in the situation....and i sitll cannot look at his face without felling embarrased...what should i do??