I love Dex too.
My guess for next season is that Hanna and Dex are going to take each other out in who knows what way. She did bite him and say you should have chosen Me.
Then Deb, that has now killed , but, also knows that so many horrendis murderes get away with it. Well, she is going to have that talking guy teach her the Code. She will continue Dexter's path of taking out the badies while taking to much Xanax, becasue of the guilt of killing LaGuarta ... fade to black. alla Soprano's