Is it normal to fantasize about someone else when married?
Mostly.Normal for most people
Yes, it’s normal to have fantasies about someone other than your spouse, even in a happy marriage. A thought isn’t the same as acting on it; what matters is how it fits with your relationship’s boundaries.
Being married doesn’t switch off your ability to notice or imagine other people. Lots of people have passing crushes or fantasies, and they don’t automatically mean you love your spouse less or want to leave.
People draw the line differently: some are unbothered by private fantasies, while others feel uncomfortable with them or consider certain behavior a breach of trust. It can help to focus less on policing every thought and more on whether you’re acting in a way that respects the agreements you and your spouse have made.