Selfish people are assholes.

For the last nine months, I've been living with a girl who has shown me that there are some really selfish people in the world. I mean, of course I knew that there is. But I had never met anyone who is this selfish. She really does not think about other peoples' feelings. And I'm learning that she isn't going to change. She just recently went behind my back, disrespecting not only me, but one of our other roommates and one of my boyfriend's friends whom she doesn't even know. And she doesn't even realize what she's doing.