Brittany Allen's poem begins with a list of fears: falling, flying, heights, and falling in love. The speaker then turns and says, "but let me tell you something." She has fallen in love anyway, and it happened so quickly that it hit her like a wave. The word "fall" does double duty here, meaning both the thing she dreads and the thing she has done.
The poem suggests the person she loves is far away, since she mentions "half a world" between their hands. She says she would face her fear of flying for just one night with them. She admits she doesn't know how they smell or feel, but she loves their smile, their voice and their laugh instead.
The mood is breathless and tender, with a hint of ache. By the end, the speaker realizes her biggest fear was never falling. It is losing the person she loves.