As a landlord, can I limit how much time my new renter boyfriends stays?

Question Details: He is there all the time even while she is at work. We have no lease. I am the owner and live in the other side of the duplex which is well maintained and in a nice neighborhood with yard. I feel like he is getting a nice place for free. In 15 years and 10+ single renters this has never come up. For the most part boy/girlfriends are only there when the renter is home.

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