Could be. But I personally think that people cheat because of this reasons:

1. They are curious and want to experience new things - Often times when you are in a long relationship with someone, one just can't help feel bored doing the same thing over and over again. Because of how long the relationship is now, people have it hard to break up with their partner and oftentimes just choose to cheat in secret in hope to experience new things with that person.
2. They want emotional validation - In conjunction with the first one, there is a "thrill" one feels when cheating. It somewhat makes them nervous, scared, etc.. and thus makes them feel alive, a much more better feeling than boredom. Some also feels underappreciated and seek that validation from someone else that they matter in this world.
3. They are not satisfied sexually -  Believe it or not, sex is placed higher in the hierarchy of needs that humans need for survival along with food, water, sleep and clothing. When physical intimacy is not enough and does not satisfy one partner, people often seek that satisfaction from someone else.