I am also facing this kind of problem. Even though , my wife has very thick hair near her waist, my eyes get stuck whenever I see any long hair.

My wife also noticed it. She got angry sometimes but I have been able to convince her that this nothing but infatuation.

Now, she sometimes even tease me by showing it when we find any long hair girl/ women on street or other places.

So, now she does not have any complaint against me as she knows I love her very much.