Guys/ladies ... how would you feel if your current partner keeps a cordial relationship with their ex?

I thought that keeping cordial relationships with your ex'es used to be considered the good, model thing to do (And I don't mean like "Don't trash them by name in public" but "Keep in touch and possibly carefully emotionally support if need be). I don't think I've personally known one woman who's broken every contact with ex'es that they aren't obligated to (Children etc.) meet, though it seems for me even if they don't completely avoid me I'll make no effort to stay in touch. Now, more and more, the psychological thinking seems to start to be that only sociopaths can stay friends with their ex'es. Lol, oops. But I really think this is one of the things that depends on the persons involved, what they were interested in the first place, and whether they're happy with how things turned out for them.