"She told me she cried in the meeting because of the look on my face. How can she not be in love,with me and cry cry for me at the same time?"
Because she's not "in love". She has "love" for you, but feels "in love" with someone else. Somewhere inside she knows it's not right, but it is what she feels- and all she will go with is emotions. She may also be feeling guilty because getting what she wants (someone else) means hurting you and the family. This will not stop anytime soon either, so back your bags for the long trip.