many years ago (20?), I was flying from LA to Vancouver to go on a cruise.  This insanely hot girl sat next to me (she couldn;t have been much more than 22 at the time).  She was going to vancouver to see her boyfriend, who had gotten this new TV series X-Files.  He was David Duchovney of course, and she was Perrey Reeves.  Amazingly nice, extremely bright.  She invited me to join them at a barbeque in Vancouver, but my cruise left that night.  Damn, that I never followed up with that.

I think that the real reason Mr. Ari doesn't cheat is strictly business.

1.  Most, if not all of the money that Ari used to finance his start up agency came from her trust fund.
2.  When it came time for Ari to buy out Terrence McQuewick, he again asked to use her money...
3.  And finally, Ari ain't no fool.  He knows that California is a 'Community Property' state and that he'd have to give up at least 50% of his holdings in Miller Gold/TMA and the house to the Mrs.  Just go ask Frank McCourt how he's doing now?
I rest my case

DD