You said; "She doesn't remember me".
Was this an imaginary relationship? Were you in the "Friend Zone"?
It sounds like you had a crush on someone who clearly has forgotten you exited. There was NEVER any (real) relationship between you!
In order for her to be "the one" she would have to see you as being "the one". Clearly this is not the case. She doesn't remember you!
Move on. Stop torturing yourself with imaginary "what ifs" and focus on the "real" relationship you're in. You don't love your old acquaintance. You still love the "idea" of her wanting you.
Nevertheless in her eyes you were in the "friend zone" at best.