I was with a girl who doesn't had long hair for 17 years. I really love her, she was kind, intelligent, sweet... but always was the same problem. Finally we split.

So... you can marry her, but always will be looking other girls hair. If your wife discovers your fetish, she will be unhappy and insecure.

If you love her, do it, but work in yourself for don't be dominated for your desires.

Greetings.