Walk away. If his wife doesn't know about you its as someone said, emotional cheating.
Only if you're planning to meet them in the flesh and the person you're married to doesn't know. The traveling alone to meet someone your spouse doesn't know about is the emotional cheating, not the talking to somebody online.Emotional cheating? Let's say I discussed investments (a favorite topic of mine) with a married woman online. Would that be emotional cheating? Let's say I had identical conversations with a married man online -- would that be emotional cheating? The only difference in this hypothetical case would be that one is named Mary and the other is John.