2. They’re looking for novelty
Sometimes boredom can push people to do things they would otherwise never fathom doing. Sex can become a recreational activity, and when they feel like they can’t find any at home or with their partner, they may look to other people to satisfy their desire for novelty.
3. They’re curious about what they’re missing out on
If a cheater got into a serious relationship as a sort of rebound after their previous relationship ended, then they may be questioning their choice of partners. They may feel as if they settled for less. They may also feel like they were hasty in settling and would like to explore the options they missed out on.