Caught Up in a Secret Desire

I’m married, but I’ve been feeling something strange lately. It started with just looking at guys on the street and imagining what it would be like to kiss them. Then I found myself daydreaming about being in a coffee shop or bookstore and having someone make eyes at me from across the room, wanting to sneak away somewhere private together. My heart races thinking about how thrilling it could be to break the rules for just one night. But it’s just a fantasy, or is it? Have any of you ever felt this way when your marriage feels stagnant but fantasizing makes you feel alive and desired again? Is that normal, or am I going off the rails here? What should someone do if they’re stuck in such conflicting feelings?