It's a Cheating Situation was created in 1979-01.
But It's Cheating was created in 1980.
The Cheating Culture was created in 2004.
Cheating Panorama was created in 1972.
Eating's Not Cheating was created in 2004.
My Cheating Heart was created on 2009-12-07.
Cheating at Solitaire was created on 1999-04-13.
Your Cheating Art was created on 2009-02-05.
Beware My Cheating Bart was created on 2012-04-15.
They've never even dated.
It's My Own Cheating Heart That Makes Me Cry was created on 2008-02-07.
There is nothing called cheating. We make a template of situation, person or our own selves and if something does not fit into that sooner or later or rather never, then we terms it as cheating.
It really doesn't matter how he behaves because you've already concluded he's cheating. It's a no-win situation for him.