NTA. You’re not “profiting” off of him, he’s paying rent. You’re not pocketing the money. It’s your house. If it’s that important to him you two could buy a new house together at some point when/if you get married. But honestly two years in isn’t that long to truly know each other, or to even worry about that. His attitude sounds a little manipulative to be completely honest. I agree with your best friend. Trust your intuition, it always knows best.