happily married but in love with someone else
https://www.bonobology.com/love-someone-else-while-happily-married/
To Catch a Cheater:Girlfriend sees boyfriend kiss stranger | Daily Mail  Online
https://www.dailymail.co.uk/news/article-5288241/Shocked-girlfriend-cries-partner-kisses-stranger.html

After reading the Sexual Conflict: Uncovering the Mysteries of the Mating Battleground by C. Nathan DeWall, it clarifies the way males and females mate. It talks about the sexual conflict in which a male and female create. It always talks about the reasoning behind both male and females sexual intent. Lastly, this article goes into detail about the consequences of sexual conflict like jealously and stalking. First things first, the way both males and females get upset. Both males and females get irritated and annoyed. That is what makes both genders upset. Although both genders get annoyed or irritated, it is what the spouse does to irritate them. For example, males get more upset when their partner is emotionally involved with somebody else. Simultaneously, females get more upset with the partner who is sexually involved with somebody else. For a visual presentation, please refer to the images above. This way is proven based on the article. In the article, Nathan Dewall explains that males will pretend an emotional connection to have sex. This statement shows females like more of an emotional connection, and they feel that the emotional connection is the key to everything. Now, this is before the consumption phase—the next phase in the relationship. Once a relationship has been established, jealousy will start to build. This is mostly when the female thinks they may have another sexual partner. This will bring sexual conflict. The last phase is the crazy phase or the after relationship phase. In this phase, males will stalk while the females re-establish another romantic relationship. This does prove that males see things from a sexual perspective, while females see things from a more emotional perspective. This is what upset both genders, sex vs. emotions.