Hey OP, how sure are you that she doesn't like you?
I think you really need to just ask her if she has any feelings for you, and if maybe she could give you a chance at a relationship.
You can't continue orbiting around her like this because you'll feel worse and worse over time. Therefore you need to get some closure.
If she rejects you, stop talking to her and move on. It will help you in the long term.
I understand your thought process: you think this one girl is perfect and that in your life no girl will ever come close, but that's not true. You're being blinded by your lust for her and when you take a step away from her and see her without rose tinted glasses, you'll realise she is just like all the other foids out there.