Why do men stay in contact with ex?

The reason is simple; the majority of guys who say they remain in contact with their ex-girlfriends is so that they can have the possibility of hooking up with you again in the future when either you or they become single. This is no big secret, many women have also said that they do the same.

What does it mean when a guy keeps talking about his ex?

Trombetti says that a guy who constantly talks about his ex is probably still hung up on her. Some of the telltale signs that shes clearly on his mind: If he talks about her a lot in conversation and her name continuously comes up, along with things they did or shared together.