It’s common for narcissists to feel like everyone else owes them something. Their self-centered nature makes them believe they can do whatever they want and they can get away with everything, as long as they play their cards right. If a narcissist’s partner fails to meet some of their needs, they would most probably go to someone else who can. What makes them different from regular cheaters is that, as they are incredibly selfish, they wouldn’t show any sign of guilt.
Lack of empathy
Not being considerate and thoughtful of your partner’s perspective is a huge red flag of your cheating potential. It’s hard to be loyal to someone when you don’t really care about their feelings. A person who shows no empathy has no clue of the way their actions might hurt their partner
Grandiosity
People convinced that they are better than everyone else often consider they can easily get away with cheating. They also feel an intense need of being validated, so seeking this validation from more than just one partner is quite a common behavior for such individuals.