My lovely boyfriend of many years is going on a skiiing holiday with one of our best friends. They are flying out together and meeting people from our local area who are staying in the same resort but in a different hotel.
One of the guys in the other group is someone I slept with quite a few times when we were teenagers/early twenties
A kind of friends with benefits arrangement about 17 years ago. I have seen him around over the years so I presume he will know that me and DP are together. I didn't meet DP until 2 years later and we started dating 2 years after that so DP does not know about him.
AIBU to wonder whether I should say something to DP before he goes? What on earth would I say!?!? "By the way, I used to shag one of the guys you are going to meet on holiday all the time!" 
Or should I just keep quiet? 