Without knowing the guy, hard to say. My husband dind't use prostitutes but he was a man-whore before we met. Got bored with it - wasn't getting what he wanted out of the whoring around. He was quite up front about it, and I am sure he wouldn't whore around now.
Some of his buddies are another story - I am SURE one guy is a married man whore. He seems like he can't be happy with any one woman - but it's really about his own unhappiness. Until he realizes that, he'll keep doing it - very unsatisfying - like groundhog day - same pattern.
Depends on the individual pathology.