Guys, if your girlfriend kissed another guy early on in the relationship, what would you do?

minda294
Earlier this year, my now boyfriend and I had talked about getting together, and we did, but I was very unsure if I wanted to be in a relationship with him. So, we split for 2 weeks for me to really think things through (I brought up the conversation, he suggested the split). However, 2 days before this conversation, another guy had kissed me and I kissed him back. I had no interest in being with this guy. It's been 5 months since this kiss happened, and I haven't told my boyfriend about it yet, because I haven't known how to tell him. My boyfriend and I are both falling in love with each other strongly, and we both can see a future with each other.

My question is this: would you justify this kiss, since it was at a rocky, "unsure", early-on stage of the relationship?
Updates
+1 y
Another reason I had waited until now to say anything is because initially, I felt it would be best that I DIDN'T tell him. My thought process was, "I made a mistake to kiss another guy. I trust myself to never do that again, and I know how I feel about my boyfriend. I know that since our relationship is getting stronger, it wouldn't be worth it to risk upsetting someone over a mistake I know won't happen again."
Guys, if your girlfriend kissed another guy early on in the relationship, what would you do?
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