Ron's hair was getting long and it was annoying him.

He had to tie it up for Quidditch and it was getting on his nerves with how much it was in his face all the time.

So he went to you, one of his closest "friends" to give him his normal hair back.

He got a picture of himself with his old hair an he went to your dorm. his hair very shaggy an unkempt.. about shoulder length.