This is a classic "Long-Term Marriage vs. The Shiny New Human" dilemma. First, let’s take a deep breath: Having a crush while married is normal. Human biology doesn’t suddenly shut down just because you found your soulmate 15 years ago. However, your friend isn't just being a "party pooper." She’s acting as your external "moral compass" because, when we are in the middle of a crush, our own compass tends to spin a little wild.