Cheating or not?

So my boyfriend and I went out with friends the other night to our university pub (it was our biggest party of the year so lots of alcohol). I don't drink much and so I over did it a little. Anyways my boyfriend and I got in an argument- he said something about his ex being attractive and I got really self conscious and alcohol tends to make my emotions go nuts. 
I informed my boyfriend that was going to kiss my best friend in retaliation. He said sure go ahead like he didn't really believe me (kissing girls is not something I do). I then kissed my best friend and kissed a couple other friends (all straight girls if that matters). My boyfriend just shrugged it off and took me home shortly after as I wasn't feeling well. 
Anyways I felt awful about the whole thing in the morning and I will admit that when drunk I knew I shouldn't have done it. I feel like I cheated on him. He doesn't feel the same way at all- he doesn't want me to do it again but he says he doesn't mind because he technically did say it was ok and he knows there's no feelings/attraction between me and any of my friends and he knows I didn't really mean it at all. 
My boyfriend and I are ok- we've talked it through and he's already saying that in a year he'll be teasing me about it. But I just wanted to see what other women thought about this?

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