it's the game of courtship.

if you want to get her, u must find other girls as well.
why did i say so ?? girls are competitive and jealous creatures.

if i use another scenario, you are a property buyer and she's the seller.
Right now you are begging her to sell her property to you.
in sales, you should indirectly tell her that you have other options as well and you are also in pursuit of another house.
Let her know her opportunity with u is also slipping away.

Therefore you are raising your ranking and if she's interested in you, she will lower her ego or expectations to get u.

if you are free, please read this Ladder Theory
http://www.laddertheory.com/

it's practically how women choose men and how men choose women.
deep down all of us, we only want to get someone which is within our expectations.