I just want to say that there are Facebook events. It sounds like this evening was one of those and he saw the woman he knows from Facebook there and giving him the benefit of the doubt, that may be all this was.

Excellent deduction figuring out his attending the bar was a result of the Facebook friend!

I agree, he could have introduced you to the woman. That would have been polite.

I have people on my Facebook I don’t really know and see all these events I could attend.

I suggest you calmly ask him about the woman and gage his reaction.