Obviously he's your fiance and you're committed to him, but I wouldn't want to be with someone that superficial. The things that *initially* attract you to someone often change, like hair length, weight, makeup, etc, so while some people might say you met him that way. I say it's just hair and he shouldn't be so hung up on it, especially if it's making you feel bad about your appearance. It's a really self centered attitude.
What if you wanted to wear your hair in a pixie cut, what would he think then?