If you found out the relationship was a giant ruse created by a bored billionaire and the person began behaving completely differently because the contract ended: doesnt matter.
All sorts of wacky scenarios you can dream up.
I can't help but feel like saying unconditional love is a giant cop out. I love people for reasons. Important reasons. Some of those reasons can't change (e.g. you are my mom/dad/kid) but those aren't the only reasons. And it's important to me to communicate those attributes of people I love. And obviously the whole is bigger than the parts in some ineffable way. And I (try to) communicate that too.
But the whole concept of unconditional love says nothing. It is a cop out. And ultimately, a lie