You and “Spencer” are close friends and on and off romantically.

Alex sits in her twin sister Spencer’s room, going through her stuff and using it to send threatening messages to the Liars. As she hears footsteps coming, she scrambles to hide everything, then stands in the way of the door. She looks at you with a “Spencer” smile, then says “Hey, what’re you doing here so late?” You can see behind her facade, but play along.