Guy, why does he ignore me when his wife shows up?

This guy at my work has a naturally flirty demeanour and everyone knows it. He has taken it a little far with me though and once he got in trouble for sexual harassment and was forced by his supervisor to apologize to me. He has since stopped being AS inappropriate, but he still likes to make his pervy comments on occasion.

Well even though he flirts with me alot( playful punches, finding reasons to touch me, talking to me all the time) ...whenever his wife shows up he completely ignores my existence. More so than normal. His whole demeanour gets anxious that me and his wife are even in the same room together.

Do you think he acts that way because he feels guilty? that's the only thing I can come up with. What would you say?
Guy, why does he ignore me when his wife shows up?
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