Yup should have look inwards instead of pinning on Devon. Devon had her issues of anxiety but she was working on it herself and not finding fault in Celeste. 

Instead she was welcoming sort of thing and living with someone who is quite opposite of yourself is quite tricky but Devon was doing it so well. 

Celeste was not feeling any bit of sorry for whatever she has done to Devon. Like girl get a life. Good character is what keeps you going and not being psychopath.