Since he isn't real, neither is the attraction.
From a psychological standpoint, Freud believed that there was always underlying sexuality between father and daughter, son and mother. (Unacted upon, but evident.) In Diana's mind, Gabe is her protector and the only one truly understanding of her needs...which sort of replaces Dan.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.