That’s why you can never have her.
You can’t be all over her. You need to present yourself somehow, whether it’s meeting her and a date, maybe dating her for a period of time and control yourself the entire time when it comes to her and your relationship. Don’t be too clingy, don’t imply you need them or you can’t live without them, do not delve into her past and harass or bother people in her past, don’t be jealous, don’t expect, just be good. Be a person you are confident she can’t let go of and if/when the time comes to split, let her go. Don’t make a fuss, don’t beg, cry, stalk, bother her or anyone else. Let her go and be confident that you are the best and MAYBE she’ll come back. Maybe, not certainly, but you always want to let her go or leave with a good impression.
It’s true that if you love something set it free and if it comes back it’s yours. That is true and very real. That saying is not b*******, but you can’t interfere or manipulate. That will make you unattractive. It will be found out, seen and it’s an unfavorable downside to you. It’s not favorable. It’s right up there with needy and clingy. Let her go, leave her alone, forget it, because she might not come back but on the plus side, every time she thinks of you, she might have regrets that she disregarded a good one. Not that you ARE a good one, you could both be stinking piles of human s*** for all I know.