I do not think it is about attraction; that's a personal word; you are attracted to an individual, not a hair cut :-) He does not want to love all women with long hair (or, if he does, he has a problem and you have one indirectly in that his ideas/feelings of what "love" is are not compatible with a happy marriage).

My husband likes longer hair too. . . and blue eyes, me not wearing jeans, etc. But, my husband loves, Me. I do not like managing my hair when it is long either (and my husband is bald, by the way, ask me how I "like" that? :-) and I can't change my eye color or my weight (not too much of a problem as my husband is obeasier than I am :-) or that I love wearing jeans. . .

If he cannot get "use to"/deal with the shorter hair, he's being shallow. There are a lot of things we "don't like" in life that are just the way things are and we have to learn to accept them or we will keep tripping over them. We cannot change another person! If we really love and accept that person, we don't want to change them and their expression of their selves. . .