The very first weekend my guy and I started dating, we saw my ex. And so, that was years ago.
Kind of related, I did run into my very first innocent bf (grades 8 and 9) with my son at a home town festival. Todd started to chat my son up about racing, and my high school best friend came out of the bathroom with her daughters and told my son, "Todd and your mom used to date." My poor son was so embarrassed.
Since then, my son has asked, "What do you think I would be like if Todd was my dad?" I reply, "Taller, but much less intelligent."