A Saturn conjunct Sun non-relationship
Was just looking at this one over at Seduction Central.
The ruler of your Seventh House of Partnership -- with Capricorn on the cusp -- is Saturn in Scorpio. And your Saturn is within a degree of conjoining her Scorpio Sun, so I understand why you feel she's The One -- your relationship significator is unified with her basic self. The problem could be that your Saturn is on her Sun. Saturn is the planet of restriction and judgment. She may feel that her relationship with you brings with it a sense of hardship.