@Triste Joven,
Anyone who is with some one to improve them is with the wrong some one... If you do not love some one to begin with you should leave them be...It does not matter what people say when they marry, or what they accept when they move in together... It is inevitable that superficial things the one does will not suit the other...If they love each other both will give; but to get with anyone when you think to fundamentally remake them is a fools quest into the impossible... People will not be remade... People have the ability to remake themselves when they want to, but it has limits... They will change for love, but when they are told they are not loved because of who they are they will not change, unless for the worse...