I dunno about you boss but that sounds like a shackle by any other name.
Besides, if you truly resented someone that you didn't just leave them but went out of your way to go through the full legal process of a divorce, I think that kills of any kind of "True love".
Okay, but like. Couldn't they just be acquaintances? Why do they need to repeat the loop?
That is a selfish and beyond stupid reason to treat an SO like shit. That's not being a tsundere or some shit, that's being willfully stupid and abrasive. If that was the case what was stopping her from talking like an adult?
If they lost the ability to reciprocate when they were adults the first time around, there's no reason to assume they wouldn't lose that ability to reciprocate as adults again in the second loop.