Is he emotional cheating or is he not happy with his marriage?

There's a guy friend whom I have known for 10 years. We meet from time to time and has asked to meet in the new year. Recently he mentioned he thinks of me sexually like kissing, base 2 and base 3 but never full. on sex as he feels that is cheating on his wife. We do have a great friendship and wondered is he planning to cheat or not happy with his marriage. They are married for 6 years. Also. does he like me more than friends? Or is he looking for someone to b comfortable with?
Is he emotional cheating or is he not happy with his marriage?
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