You are compatible, sexually and otherwise, with many other women. I, too, "hung on" for several years to the memory of someone who was very special to me. It's difficult to break away from someone or something we love(d) dearly. My recommendation: Channel all that energy from masturbation to getting out of the house and finding some real pussy. You'll find those fantasies begin to fade once you have a life again and you have some "dirt for your worm."
Go get with someone else.
Seriously dude.. for me its been 5 months and I still think abotu her when I masturbate, and having all those videos of her riding my big cock over the years doesnt help much either. Nonetheless, Ive gotten quite a bit of pussy since then, keeping a steady supply is key to forgetting the ex.