One reason could be lack of attention from her husband. If he is always working long hours and not spending time with her, she might feel lonely and seek connection elsewhere.
Another reason might be a change in her own self - identity. Maybe she has new interests or goals that her husband doesn't support or understand, and she meets someone who does, leading to an affair. For example, if she has a passion for painting and her husband dismisses it, but she meets an artist who encourages her, it could lead to trouble.
One possible reason could be that she was not satisfied with her own relationship before the wife swap. The new environment and the different personalities in the swapped - in couple might have attracted her.
Family is another big factor. She might think about her children and how cheating could impact their lives. For example, a divorce resulting from cheating could lead to a broken family environment for the kids. Also, she may have a good relationship with her in - laws and not want to break that bond through her actions.
Another reason could be revenge. If a wife discovers that her husband has been unfaithful or has treated her badly in some way, she might decide to cheat as a form of payback. For instance, in a particular story, a husband had an affair and his wife found out. To get back at him, she had an affair of her own.
One possible reason could be blackmail. For example, someone might have some incriminating evidence about her or her family and force her to have an affair. Another reason could be extreme financial pressure. If a family is in dire straits and she is pressured by someone who offers a solution in exchange for an improper relationship.
Another reason could be boredom. If her life has become monotonous and there's no excitement in her relationship, she might look for it outside. But these are just fictional reasons and not an excuse for real - life unethical behavior.
One possible reason could be his inability to handle the stress of having a sick wife. He might be looking for an escape from the difficult situation at home. Another reason could be his own lack of moral values.
One reason could be a sense of adventure or the allure of the 'forbidden'. The interracial aspect might add an extra layer of excitement that she is seeking outside her marriage.
Sometimes, it could be due to a lack of communication in the relationship. If she can't talk to the boy about her feelings or problems, she might look for someone else to confide in. Also, peer pressure or the influence of her friends can play a role. If her friends encourage her to be with someone else or make her feel like she can do better, she may be more likely to cheat.
One reason could be that she has fallen out of love with the boy but is too afraid to break up. So she cheats instead. For example, if the relationship has become dull and she meets someone new who seems more exciting.
One reason could be the allure of the new and different. The young male nurse represents something fresh compared to her regular life.