Ok, 1st off, the sexting with the ex wife thing is of course totally unacceptable. It's completely disrespectful and I recommend not putting up with it. If he stops and gets help for being an ***, then good. But if not, he's not worth the misery.

But the pornography thing... well, if porn is cheating then I'd have to say at least 95% of men are cheaters. No matter how good a guy is, no matter how satisfied you keep him, he's still got a pervy side and is going to enjoy his private time looking at naked naughtiness. It may even be part of why he's such a good lover. Even a whole lot of females watch porn nowadays (most of my female friends and I watch porn. we're all in our 20's and 30's and a few of us are in healthy, happy relationships/marriages). Most people masturbate. Ask any doctor or therapist. It's a part of a healthy sexuality, unless of course the person is watching something very taboo that no one should be watching or doing. So to say it's a betrayal is a bit unreasonable. Porn isn't a replacement for you or even a threat, it's just a medium to help us escape for a moment and release. I guarantee that the second he's done doing his business, he doesn't give any of the girls he's watching or looking at a second thought. In fact, he may even be thinking of you doing those naughty things or thinking of doing them to you while he's watching. ;-)