Romantic and Practical
Women are romantic creatures and they need romance in their lives, they need flowers and hearts and candies and candles and the whole romantic stuff that proves them that love is still alive. But men are different from this point of view and they can easily live without the whole romantic stuff that is so important for women.
Men are practical people and they care about the common things that are important for common living of people and they know that they will never survive with only the romantic stuff and they know that it s necessary to concentrate the attention on common boring everyday stuff. So, here they are the polarities for each other: romantic person and practical person.
Though, they are happy together because the romantic person brings romance into a life of the practical person and the practical person provides the romantic person with the whole everyday stuff that helps save the romance. See, they also supplement each other and there are no people best for them except themselves. They are the happy medium together.
In case both of them are romantic people they soon will break up because there is no romance without the everyday stuff that is like a source of life for the romance. And those practical people will soon get bored with their relationships.