I feel bad for her. I think she might still be hung up on him, although I think it's fairly clear at this point that she's low on his priority list. She's defending him and talking about how "extremely handsome" he is, while he's out there living his life and having a good time. Just take a look at his Instagram -- no mention of Catherine, the show, but plenty of pictures of him with other girls, going out, having fun.
Like others have mentioned, Graham actually seemed like a fairly normal teen. I doubt he honestly expected that Catherine would develop such deep feelings, without even me