They think I don't know...

She thinks I don't know about her.
She thinks I don't see the way her eyes light up when he walks into the room.
The way her eyes follow him wherever he goes.
The hair on his collar.
The way his hand will absently seek her out, even when he isn't paying attention.
Oh ya.
I see it.
I know about her... the other woman.
The wife always finds out.