I really don't get it

I don't get what I do to turn that switch on inside of you where you just decide for a few days you don't want to talk to me. Those days you make me feel so small and inferior, and striking up a conversation with you is near impossible. And when I try, you look at me with those eyes like "just stop talking, Shelly." Why do you do it? Am I really that stupid to you? Why do you only treat my like a friend when no one else is around? Can you please explain this to me? No, you can't. Because to be able to do that, you'd actually have to look at me and talk to me, which clearly is just not an option.