Why would a married man slowly start to brush off his mistress?

* The magic Word is 'married.' He may have gone off the righteous path and realized he had made a mistake or he simply doesn't want to cheat on his wife any longer no matter how tantalizing the prospect may be. If he was dating you then realize some married men want the excitement of an affair, but the woman involved in the affair is seldom the woman he will leave his wife for and if he should leave his wife he generally wants his freedom and doesn't want to commit to another women at the present time.