I don't know your friend and the way she thinks but maybe she just thought she would be a little bit cheeky and put it out there to use the passes (you know, the old "if you don't ask you don't get" thing) and thought maybe the movie would not be something you would see with DH.

And personally, if I made a comment like that on FB (which I wouldn't because it just isn't my style) I would be quite accepting of your answer and think it was meant nicely, and I would move on and not give it another thought.

So, don't feel guilty, they are your passes to use as you see fit. Lucky winner!!