Is this considered cheating?

My husband was flirting with a woman at work. Not just normal office flirting. They were asking each other intimate questions. I.E. what turns the other on and they started acting upon the stuff they could do at work my husband has this thing about his ears major turn on when they are touched and she apparently strokes them any chance she gets and she apparently likes having the small of her back touched which he also touched. The only reason I know all of this is because it came out in an argument. Because he wanted to show me how easy it would be for him to cheat on me IF he wanted too. I say he's cheated already He doesn't think so. What do you think? 

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