You didn't know that sharing a drink with her would mean you were engaged. You still don't know you're engaged to her.

But Allele knows, and she thinks this is the most romantic thing that's ever happened. She's engaged! She never dreamed something this magical would happen when she took a position as a navigations specialist aboard the Cassiopeia. Though she thinks it's strange that you don't reciprocate all of her romantic gestures, she figures you're just shy about inter-species relationships. Or maybe your courtship rituals are different. Whatever, she'll learn your culture as your wife.