Before I ask for advice I want to clarify a few things:

I'm 20,

I lift 5x a week,

I've read the sidebar (read it two years ago, but only began to internalize it this past year),

I go to a top 5 university in my country and am towards a degree in Computer Science -- (I'm not aimless, I have a mission),

I have a few close groups of male friends and do not lack social skills. I consider myself popular.

A little over a month ago, my LTR of 4 (!) years moved away. We decided to end things on a good note. Over the course of the past month, I've slept with 6 women, most were more attractive than my LTR and one of which was a model. It felt great in the moment, but I never really liked any of them for more than their looks and the physicality of it.

I feel that I should be satisfied: I've made major progression in my work life, sex life, fitness, and social life. I don't know why I still feel so empty after this girl has left. I've been with many other girls and still have oneitis. How do I move the fuck on with my life?