Please people there is this guy that had an ex he was not really into which made him cut her off. but lately, the girl has been pestering this guy who now has another girl. he has talked to her to no but she would not budge. This is threatening the guy's new relationship because the ex leverages on the guy's relative to sleep over in his house then pressurizing him to have sex with her as she also a friend of his sister.

The question is how can he tell her off and make her stay off without moving out of the apartment?