All About A Girl... 4 Years Later, How Come I Cant Move On?!?!?

It all started over a simple friendship gone wrong...and to this day Its all the same no matter what I try/attempt, or program I take, distance I go etc. This whole scenario started years a go when I was about 11 yrs. old and adopted by a rather F** up family and met this girl who wasn't related to us at the time but was the daughter of a close friend of ours who later married my adopted brother. Anyways, we met shortly after this marriage and began to get real close even though at first I was really against it I had this "pulling connection" to her, non-sexual yet just as potent like the worst kind of addiction. However, as all love stories go things got too close and we eventually we "fell in love" aka really, REALLY got too close with each other when I turned 16 and she was 13. As time went on, I found out she conned me, cheated on me, and the whole nine-yards-of-a-doomed-relationship cliche plus she ended up humiliating me in public plus my family witnessed the whole **** as well. My question is this, why do I still love her even though she did that to me after all these years? Why do I still have that "pulling connection" **** still? Is it because of my "illness/aspbergers/cancer" and somehow that connection we had is something my mind is not able to erase entirely? Or perhaps it is of an unrequited, dejected sense of need since she was all I had during my time in that farm from hell? This isn't the average love where you suck it up and move on; I'm talking about the serious, unending love that feels worse than 6 nails to the heart. Please be serious and try to help me out, I aint got long and I need some peace of mind!