Why?

I am 23 years old, and teaching overseas for my second year in the Middle East.
I have just broken up with my boyfriend of a year this past weekend and although it is not a long period of time, I am left shaken from feeling forced into making this decision against my will.
From day one I was completely in awe of this guy and that's where I started making sacrifices and slowly lost all of my expectations of how I believe I should be treated in a relationship. Every weekend, and weekday for that matter, I would feel neglected and unwanted. He would always choose his friends over me, and would drink until 6 am in the morning to the point where I would leave and cry out of frustration.
Looking back at it now I feel so stupid for not leaving sooner, because when I said goodbye he told me he didn't love me and this was for the best. Yet, he is a very intelligent man and very capable, so I question why he didn't want to step it up for me? Why I wasn't worth it to put effort into making it work and making me feel more secure...?
The worst part about it all is even though to my girlfriends I would constantly express my frustrations, I always held a glimmer of hope in my heart that one day he would "wake up" from this trance and void of emotions, and now I feel left without any dignity and completely used for staying in something that was pretty much "hopeless".