I think it's all about personal preferences. Some men like blondes and others prefer brunettes. I've always dated men who liked exotic looking women with curly hair. I would be angered as well if my boyfriend said that to me especially when he met you when you had curly hair. He should accept you & love you as you are.
I could never be with someone who said they didn't like curly hair. I know women who have curly hair & their husbands prefer straight hair & I honestly don't know how they married them knowing that. It's one thing to be young & single & be able to maintain straight hair but it's another to be married, holding a full time job & looking after children & finding enough time to put lipstick on in the morning.