Empath, your first responsibility is to take care of yourself. You are already letting this guy hurt your feelings too much, excusing his bad behavior - like his talking about cute latina girls, or calling doing things with you "science", or even the anticipation of his dropping you for this woman who has completed her basic training. Believe me, I totally know what it feels like to be in your shoes. I wish I didn't. Open Eyes said so many good things here. I would ask, why aren't you putting all this time and energy into YOUR happiness, into your future plans? It is time to get passionate about you and your life. You do have good insight. Now use it to see how these issues apply to your own life?