should i confess to my boyfriend that i cheated on him?

[Celina]

My boyfriend and I hang out with the same group of friends. One day I invited three of his friends over because they wanted a place to drink. I got extremely drunk to the point of almost passing out on the bathroom floor. One of the guys carried me into my room and laid me down on my bed; he said that they were going to clean up the living room and leave to let me sleep. One of the guys forgot his sweater and he texts me saying how he was going to come back to get it. I told him no and to just come get it the next day but he said it was too late and that he was already at the door. I couldn't get myself up, I was completely wasted and blacked out. I let him in and told to grab it, it's on my chair and to close the door on his way out. He ended up sitting down and staying and since I was intoxicated and in need of my boyfriend I was being nice towards him and giving him the wrong idea. He took his shirt off and got on the bed and started kissing me on my neck. I knew what he was doing wasn't right but i was so drunk that I couldn't even tell him to stop. Actually i couldn't even talk clearly, just babbling. He took complete advantage of me. He saw how helpless i was and weak. Although we went all the way, i didn't touch him at all or kiss him. But i still feel guilty. He knew what he was doing when he came back for his sweater and he took advantage. He is best friends with my boyfriend and i don't want to ruin that. Even though i didn't plan on cheating on him and didn't actually cheat on him, i know it's still considered cheating. It happened unpurposely. Should i tell my boyfriend about this?