Molestedby close friend

Last night I was touched by a close guy friend when he thought I was passed out drunk. He also touched my best friend, as we had all fallen asleep on the same bed. He took the straps off my shoulders and fondled my breasts and nipples, then tried to touch downstairs. He got to the clit and that's when I snapped out of my fear coma and rolled over, still pretending to be asleep. I don't know how I can tell anyone, especially my boyfriend of 2 years, because they used to be good friends as well and I don't want to ruin any relationships. I know what this friend did was horrible but I don't want to loose his friendship. So, my question is, do I tell my boyfriend? Please be sensitive, I'm still shooken up. Thanks