Leave her alone, is the best advice you will receive here
What exactly are you planning to get? What's your best case scenario?
She breaks up with her bf to be with you? That might be a great ego trip, but in the real world all it will mean is she's not trustworthy and she will do the same to you. People who don't like their partners break up with them because they don't like them, not because there is someone who's better out there.
Don't cry, don't regret and don't blame
Weak find the whip, willing find freedom
Towards the sun, carry your name
In warm hands you are given
Ask the wind for the way
Uncertainty's gone, your path will unravel
Accept all as it is and do not blame
God or the Devil
~Born to Live - Mavrik~