This strikes me as important: that we should look for ourselves in the reflection in the relationship mirror. This indicates that relationships ultimately teach us about ourselves in a process of self-learning. Intimacy is about both our inward plunge and outward extension to another. As we progress in our comprehension of our own deepest nature, we are contacting the Ground of our Being in the Universe and there resides Love in the Universal sense. The self-knowledge/self-love becomes Universal Knowledge/Universal Love. Another way to put it is that to contact the love in our hearts is to love God. Relationships, no matter their difficulties, pain, and impermanence, teach us about ourselves, thus about God.
On another matter: Probably the most salient reason that I have such a high regard for females is that they have a tendency to be more developed in both interpersonal and intra-personal matters (a generalization, of course). It is accepted doctrine in education, according to Howard Gardner (in Multiple Intelligences), that humans possess at least eight intelligences. Two of them are interpersonal (between people, i.e. relationships) and intra-personal (self-knowledge). (It seems to me that the two types of intelligence are linked.)