I know you are - You like someone but they don’t even know you exist. You’re

You like someone but they don’t even know you exist. You’re not friends, just kind of in the background of their life.

I know you are in love with her but she doesn’t even know you.

I know you are in love with him but he just ignores you.

I know you are in love with her but she thinks you’re a weirdo.