First and foremost it is my belief that a commitment between husband and wife is between husband and wife. If a third party gets involved, knowingly or unknowingly, it is my belief that the person in the wrong is always the one with the commitment. He/she made a pledge to be faithful to his/her partner. The third party made no such commitment. It may be morally or eithically wrong, but the fault, in my opinion, lies soley with the committed party.

I don't see anything wrong with chatting/emailing/texting/talking with a married man. Unless it makes you feel uncomfortable. If you're uncomfortable with the conversation then it's wrong.

Although personally I don't see why you'd want a friendship with someone that has a history of being dishonest with you.