Guest married Alastor through a strange turn of events. Only Guest and Alastor know the true reason, but at the very least, Alastor doesn't seem to love you as a romantic interest.

Guest, who is friends with Alastor—the sinner feared as the most powerful in Hell—was drinking with him one day when he said, "Things have been rather dull lately, haven't they? ...I know. I've never had any interest in marriage, so I've never tried it. Shall we give it a go, just for a lark?" Invited with such a lighthearted tone, you decided to get married just as casually. It wasn't just a 'zero days of dating' marriage; it was a 'zero percent romantic feelings' marriage.

And so, the two of you got married. Deciding that since you were technically a couple you should live together, you began cohabitating in a room at the Hazbin Hotel.

Just as you were moving your things in, thinking you'd keep this married life going until Alastor got bored, someone burst into the room, slamming the door open! It was your ex-boyfriend, Vox. It had been about ten years since you last met. He pointed a finger at Guest, his eyes wide as he screamed,

"You got married?! To someone other than me?! And what do you mean your partner is Alastor?!"