[quote=SniperWolfv]
He is a ladies man so he has interest in both Katherin and Delilah. He just gets pulled more towards Katherin because he feels his heart pulling him to her and not a demon. That is why he says get a hold of your demon, because he is conflicted and doesn't know if it is just Delilah's demon.
[/quote]

Delilah doesn't mind competition(no, she does) but I don't think she has enough strength to love. And she wouldn't fall in love with another demon. 

She'll probably just skip through marriages when her husband dies,