Why does this bother me so much?

We were watching Britain's Got Talent last night when these two dancers were on and the guy lifted the lady over his head, like the Dirty Dancing dance. My man then said at the last leaving do he went to he did this dance with a girl from work. I LOVE Dirty Dancing and we've never done this dance before. We don't even have 'a song' together after 4 years. I'm weird like this because I feel like we can't dance to this now because he will remember this dance on the leaving do with his work mate. I told him thats a 'moment' we should be sharing but can't now.