Is NOBODY wrong in the post ? POST : The night before my first date with the girl who is now my fiancée, my best friend (a girl) gave me my first kiss ever, as "practice" and to give me a "confidence boost" (quotes because those were her words) before the date.

I used to have a big crush on my friend, but by the time of our kiss, I had long moved on, and saw her as just a close friend like I do today. I didn't want to tell my fiancée, because I don't think it's a big deal. And she really liked the idea of being my first "real kiss", so I didn't want to ruin that thought for her. 

Also my friend has a flirtatious personality and is always teasing people, guys in particular (and me included), which my fiancée doesn't like, even though she still likes my friend. We hang out together once in a while, she comes to her place to have dinner, usually with her boyfriend of the current month (she changes relationships a lot). I don't want to make things awkward, that's also why I haven't said anything. 