Just as a man moves from one phase of his life to the next, so does a woman do with her relationships. Sometimes, the familiarity we experience with our significant other may be enough to keep us in love. But more often than not, it's the experiences that we don't share with our girlfriend (or, better yet, our wife) that end up shaping who we are as individuals and as a couple. For example, if a man's girlfriend has been there for him in the most wonderful times of his life (when he was down and out and didn't have a girlfriend), he will inevitably come to feel like he has reached a new level of intimacy with her..