Am I a bad person??

My spouse and I have been together for 5 years. Here recently I've found that I've had an infatuation with someone else. Not necessarily wanting to be with them but thinking about them all of the time. It's also crossed my mind a few times to cheat on my significant other here lately. I don't know if it's because I'm tired of the same old thing all the time or not. I need advice. Am I a bad person for thinking this? I should have also said I don't plan on doing anything. Just a feeling.