- May be
Most Helpful Girl
It depends on the break up and also how the two started.
If the two have always had feelings for each other and never really been friends then no I don't think it's a good idea to remain friends afterwards. There will be a lot of emotions and jealousy between the two (both positive and negative) and it's not fair on any new people that enter either of the people's lives.
If the break up wasn't to do with the couples themselves than I can understand two people remaining friends afterwards - after all they were there for each other emotionally when they were in a relationship, why not afterwards too?
Generally speaking though, I don't think it's a good idea to remain friends. 9/10 it's best to go your separate ways and stay civil if your paths do cross.