Sneakyone wrote...
its a chemical imbalance
Well our bodies create or have chemicals like dopamine, and serotonin when "in love" with someone, but no one really calls it an "imbalance".
PumpJack McGee wrote...
Biological survival mechanism
Maybe for some humans.
I'd call it "evolutionary survival mechanism".
OT: I guess I'd just call it, "attachment". That seems to work around all "what if" questions.