Have you ever had a "crush" on someone else since you have been married?

I have been happily married for a few years. Within the last month, I have developed a “high school crush” on someone on a rec team I play on. While I don’t think about cheating on my spouse, or taking it any further than casual flirting, is this considered cheating? Have you had feelings like this for someone other than your spouse? What was the outcome? Should I make a real effort to stop, or could this be considered healthy?

Am I kidding myself that this is harmless?