I don't necessarily believe in them either, but I focused on "long-term definitive love interest." I got what the OP was getting at. Selina is appearing to take on a recurring long term (even if on and off) love interest role in Bruce's life. Lois Lane is that for Superman. And what is Dick's?
Yup that's what I meant. I just did not want to use the exact same language in both the question and text of my opening message.
"So you've come to the end now alive but dead inside."