Should i tell him what happened?

My boyfriend of 9 months and his flatmates were having a party the other night and I was mixing my boyfriend a drink in the kitchen when his friend that I've known for a while walked in and started talking to me. He asked for a drink too, so i made him one while we were joking and laughing together- totally friendly, not flirty. Once I was done I started to walk out of the kitchen with my boyfriend's drink and his friend grabbed me around the waist and tried to kiss me. I automatically moved away and and walked out of the kitchen. The drink i made him was his first, so i know he wasn't drunk. He is good friends with my boyfriend and so i often see him and now i feel really awkward about the situation. Im not really sure if i should just tell my boyfriend or not. I don't want this to backfire on me at any point as i made it obvious that i wasn't interested in kissing him or anything, but could it be turned around on me?