I am no longer in touch with anyone I've had a relationship with in the past.
There was one man that I stayed friends with long after I had got over the relationship. However, the "staying friends" stuff dragged out the process of getting over the breakup to painful lengths. The friendship lasted as long as he needed a mate in the area to pass an evening with when he was around here, and someone to fill out the numbers and buy a present when he got married. When I married, it was much further from Newcastle to Cheshire for him and his wife to travel than it was from Cheshire to Newcastle for us to travel to his wedding, so they couldn't make it. Dipshit.
So......
If a couple has children, it's desirable that they stay at least civil with each other. But if you don't have that kind of long term link, i.e., you don't HAVE to keep in touch, is it possible or desirable to stay friends?
In my experience, it drags out the pain of the break up, and you just get on each other's nerves. If you liked each other that much, why break up? What do you think?