Brother, it sounds to me like you've exagerated things in your mind. It sounds to me like she is just a person getting on with her own life, but in your mind you believe there might be a relationshtp - where there actually is none.

My feelings are that the best thing for you is to forget about her, destroy the obsession - because that's what it is - and focus primarily on your own life. You're focusing too much on this person and it's not doing you any good. Forget about her. It's all in your mind brother.

Let go, please. Focus on your goals instead.