Naturally, people had some thoughts on this one! Nearly everyone sided with OP, and many commented on the irony of this guy not even paying rent, then demanding half of the rent she collects:

“Let me get this straight. He must not have offered to pay half of the rent, because then it would have come up, and you would have told him, right? He is living with you rent-free. Up to now, he thought you were paying the entire rent. On what planet does he deserve half of the tenant’s rent money?”

—u/LingJules

“This dude was happy to exploit you for free lodging, and now that he finds out you’ve got income he wasn’t aware of, he wants half of it just because, or else you’re a big meanie? You do not owe him an apology. You owe him a kick in the rear.”

—u/WhyCommentQueasy

Source: https://www.buzzfeed.com/morgansloss1/woman-landlord-boyfriend-wants-half-the-rent-reddit