A Secret Scent of Desire

I’ve been in a long-term relationship with my partner for over ten years. We have a solid and loving connection, but lately, I’ve felt a strange pull towards someone else’s smell. A few weeks ago at the gym, I accidentally shared an exercise towel with another man who used it before me. The scent clung to me all day long, sweat mixed with some kind of cologne that reminded me of my own youth and vitality. It was distracting and oddly enticing. Since then, I find myself lingering in places he might have been, just to catch a whiff of him again. I can’t explain this attraction, especially since it’s so out of character for me. Is this normal? Should I talk to my therapist about it, or is this just some passing phase?