I practice what I call "self-sabotage". If I know for sure that a woman is interested in me, and I've known her for a while, I'll deliberately become colder toward her. It's basically a form of self-defense. If I push you away, you won't put me in awkward situations that require I reveal more about myself than I'm comfortable with. If the woman is a complete stranger and doesn't know me from a hole in the ground, then I'll happily talk to her and flirt... up to a point. As soon as you start to get too close, become too curious, too insistent, that's when the walls go up. I reject you before you have the opportunity to reject me, which is, I guess, a form of emotional cowardice. But then I've never claimed to be brave. In many ways, I am my own worst enemy.