The speaker is afraid of what happens when other people finally see the full picture. At first, those people noticed only the "twinkling of the stars" in the speaker's eyes, a bright, appealing surface. But the speaker knows there is also "poisonous gas" around them, something harmful or hard to be near, and fears it will eventually be noticed.
The most unsettling part comes at the end. The question "And then?" hangs in the air, and the answer is not anger or rejection but something quieter: people "choose to see nothing at all." They look away on purpose. That suggests the speaker expects to be ignored rather than confronted, which may hurt even more.
The mood is anxious and lonely. The short, flat final line feels resigned, as if the speaker has already imagined this scene many times. The title's mix of beauty and poison captures the tension: the speaker feels both lovable and toxic, and dreads being left alone with the second part.