Dear LIB Readers: Is it okay to keep in touch with an ex?

From a LIB reader

Please is it okay to keep intouch with an ex? My wife thinks its not right and has been fighting me for communicating with my exs. One is married while the other is still single. The married one is the one that calls often. They call to check on me and to ask for advise and I also call them to know how they are doing. I don't think there is anything wrong with it but my wife is fighting me about it. Please will like to know other people's opinion on this. Thanks