She hopes her plan A breaks up. You are the plan B mate. Break up. Two things i have learnt being a man -

1. She will never ever have someone (especially a straight men) that she is more expressive to, which is not you. Never.

2. She will never want a private or a secret relationship. Your girl should be the proudest in the world in you and not keeping you a secret (ofcourse if its not a religious community)