Happened last night, do I [37m] tell my fiancée [34f] that her best friend tried to come onto me?

So last night I went out to this bar to get some drinks with my finance’s best friend since my finance had a meeting for work and I was off. She’s married as well btw. We were just catching up havong a good time laughing and having drinks. Once we were ready to head out she went to the bathroom I went outside to smoke a cigarette. I was smoking and on my phone scrolling through tiktok when I hear behind me “hey you look really cute”. I turned around to see her walking out and the first thing I thought was she thought I was someone else but once I saw it was her I was shocked. I was like awks “ thanks”. She walked up to me and stood next to me and just asked if I was having a good night. Filled with awkwardness I said yes. I didn’t know what else to say it was so weird. I know when someone is flirting and she was flirting. So I said well I’m gonna get out of here. She tried to hug me but slipped and fell into me. I awoke her up and she looked into my eyes and said to walk her to her car. Once we were by her car she started kissing me. I backed off and said I can’t do this. We’re both married and I’m upcoming married. She said it’s just a little fun nothing more. I told her no and got into my car and left. Should I tell my finance?<br><br>UPDATE: it’s been crazy and I just got out of work. I’m going to tell her tonight. Haven’t had a chance to yet. I will update tomorrow. Thanks for all the help.