TLDR. I took my girlfriend's friend home years before we got together and she doesn't know. Should I tell?
M35, girlfriend J is F34. Together for 18 months but friends for years before. Maybe 7 years ago J was with her ex and 2 of his friends broke up. I knew them both. Shortly after the breakup, on a night out, the girl K (f32?) was there. We kissed and she said she didn't want to be alone so she came to mine. We did some foreplay but she didn't want to have sex and we agreed it was a bad idea. She left in the morning and I haven't seen her for years (we weren't close friends really).
Fast forward some years J and I got together 18 months ago. She has remained friends with K. To my knowledge, nobody knows about what happened. I certainly never told anyone. K started working in the same office as J a while ago. Tonight they are going for a drink and I'm going to meet them and I am freaking out. I feel like I have to tell her what happened. I don't like secrets.
My natural instinct is to tell her because I keep no secrets from her. But then it's not that bad I guess? Please help me get out of this panic attack thanks.