I mean, his wish was to get married. There can be two outcomes:
First: Marriage means they gotta stay together and that's related to the contract.
Second: Helvi is too attached to Theo. Even if she has to leave, she'll instantly come back. She's the strongest, anyway. Who's gonna stop her?
So don't worry. They're gonna be happy forever. But I'm just sad it's ending.
Just someone with a bit too much trauma and a heart too fragile.