Ekpen by Sophie Stern

A planet with more cats than people…
Grimalkin needs brides.

Earth is a dystopian nightmare that’s going to be destroyed very, very soon. Nobody knows exactly when or how, but the threat of destruction looms in the background of everyone’s mind.
Holly is ready to escape from her planet, but there’s a problem: only rich people actually get to leave Earth, and she’s barely got five bucks to her name
Enter the Grimalkin Bridal Exchange.
The deal is simple: she goes to an alien planet, marries some random dude, and gets to live out her days in luxury and happiness.
Only, the guy she’s paired up with doesn’t want to get married.
And he doesn’t want to get married to her.
In fact, he actually kind of…hates her.