Coming from a husband (myself) with a PA (though I have a strong streak going, and I'm not turning back). Love my wife too much, and hate what this industry has done to both men and women.
I can tell you that most men, feel incredibly embarrassed with our addiction. Which is one of the main reasons most of us deny using to our spouses. My wife caught me years ago, and she plainly said "if I was intimate more frequently with you, maybe you wouldn't resort to that"...little did we both know, that wouldn't have made a difference.
Looking at it now, if you do confront him, I suggest trying to discover what is pushing him towards it. Some of us, it's stress, anger, anxiety and a host of other reasons that aren't actually sexual. I'm discovering this.
My advice, if you love him, be patient and willing to work with him. If you don't love him, then that's another story.