I have a dh with a baby and the colleague has a girlfriend with no kids. I have strictly a professional relationship with all my colleagues and I’m friends with a few of the female colleagues and go out for drinks now and then but that’s really it.
On wednesday last week night me and the male colleague had to work late (I had amends to do and he had to finish off an email) nobody else was there apart from a few other people in the next block I think. He came over to me almost out of the blue from his desk to show me some articles he had read and joking about it, I just laughed and then he took a chair and sat next to me which I thought was quite weird (I was still trying to finish off the amends) he then said how beautiful he thought I was which I was started to get really uncomfortable and thought he was possibly drunk. Then he kissed me and I immediately pushed him off of me saying asked him what he was doing. I was in utter shock as we rarely ever speak and I have never thought of him as anything more than just a “guy from work” and I thought he thought the same of me but I was quite obviously wrong.
I got my bags within a flash and left and the next few days at work he has downright avoided me at all costs which led me to think that he was probably drunk and regrets what he did, rightfully so.
Would I be unreasonable to bring it up to our boss or just leave it as a drunken mistake?