I was reading another thread, it got me thinking.
If you have a relationship with someone, then that relationship ends and both parties have moved on - why is it a problem if the ex then starts going out with one of the woman's friends?
Once, a friend of mine asked me for permission to go on a date with my ex. It surprised me, because I was unaware of any kind of rule that existed. I now know about this unwritten rule, but why does it exist/why must is be followed?
I genuinely don't understand; no offence is meant to those who would have a problem with ex-boyfriends and friends going out!