As time goes by, I realise that the best relationships don't just happen. It takes two people who are willing to make efforts and sacrifices to change themselves into two pieces of a puzzle that are complementary to each other, like how an enzyme fits to its substrate by moulding itself so that they could fit perfectly and only then, BAM, chemistry takes place. No, you don't just sit there and wait for your other half to change just because he/she loves you. It should be a process where two of you grow up alongside of each other, knowing what each other wants, putting yourselves in each other's shoes and understanding what you want.
Even in fairytales, Cinderella has to learn how to be a princess and Prince Charming has to accept the different way of thinking of a commoner for them to live happily ever after. Changes you make in relationships is not always a bad thing. It can mean that you are mature enough to not get head over heels with the sparkles in the early stages which will fade away very soon and make rational decisions to make your relationship last forever.
"You don't change the person you love, you change with them."