My sister-in-law was dating a really great guy, but he decided that their relationship could not continue. It was devastating for both of them to an extent (he didn't want to hurt her feelings). My kids haven't seen their aunt since-- she decided to visit out-of-state relatives this weekend, and we had made other plans as well.
I told my kids that "Dave" isn't going to be at family parties anymore and to not ask "Aunt Marie" about him. There is a chance that they could get back together.... but I'm not sharing that part with my kids. My boys really liked this guy, and he liked all of my children, nieces, and nephews too.
Have you had to deal with something like this? Is there anything I should add to the discussion? My oldest still has no interest in girls or dating, but how might I teach him what "breaking up" is about? (Note: he does not interact with divorced people, so that might skew his understanding.)