Should you be friends with your exboyfriend after breakup?

For some it may work, but it's a low percentage. Once you break up with someone then you shouldn't be talking to them on the phone, Iming, texting, etc. It's time to move on. If you happen to bump into him there is no reason not to be nice. Most new boyfriends don't like sharing their girlfriends with their exes and consider the ex an intruder and who can blame them.