I am so in love with my girlfriend of 4 years, she is everything to me, our relationship is great and i enjoy spending time with her. However, I dont sexually desire her anymore, or at least not as much as i did when we first started dating 4 years ago. I find myself always checking out women and wanting to sleep with other woman. My girlfriend and I still have sex, just not as much as we use too, and I dont desire it as much as i use too. I have been contemplating breaking up, but this is a hard thing to do, especially when I truly believe I could spend the rest of my life with this woman. What should I do, Is it time to call it quits.