Meeting my boyfriend's female boss...is this weird and how should I act?

My BF lives in another city and i am going to see him very soon. His boss seemingly knows a lot about our relationship and even suggested early on that he wa sin love with me, which he was. She now wants to meet me and is taking us to a very swanky restaurant while I'm there. My questions are, why is she so interested in me and how should I be around her? I feel like I'm stepping into an interview or being looked over with a microscope, or worse, that I will be intimidated by the familiar banter she will inevitably share with my BF. Help, what should I do to keep my cool and not feel so dreaded about this meeting?