My doppelgänger is kind of a jerk

I think I mentioned my doppelgänger in this sub a while ago. He looks eerily like me. Same haircut, same manner of dress, same body language, everything. He's even as eerily pale as I am, and I don't like it.

Just now he was standing outside a locked room and I got up from what I was doing to let him in. I didn't say anything, I just opened the door. He didn't even say thank you, he just gave me a weird look. I'm kind of wondering now if he's even real. Or maybe I'm the one who isn't real? These days that sounds like the more pleasant option.