No definitive answer exists to this question since every married man is different and every situation is unique. However, it is generally thought that men who cheat on their wives do so because they are not satisfied with the emotional or physical connection they have with their spouse. In some cases, a man may initially cheat on his wife out of physical attraction to another woman but eventually develop deeper feelings for his mistress as the affair continues. While it's impossible to say for certain whether or not married men can fall in love with their mistresses, it seems likely that it could happen under the right circumstances.