Hm. Difficult position. Current residents

Hm. Difficult position. Current residents of new house have had someone new move into the basement room. Originally, he just wanted to use it as an office, so he would only be around occasionally during the day, but he would still have been paying some of the rent, so that would have been okay with me. However, now he’s decided that he wants to LIVE there, and I don’t know that I’m so cool with that. I mean, okay. I’m sure he’s a nice guy. But after being told that I would be able to fill the house with whoever I wanted, I feel sort of bad that I may be put in the awkward position of saying “I’m sorry, but your friend can’t stay here. You said it was up to me, and I really want to live with women. If he wants it as an office, that’s fine … but I don’t want him living here.” I know that by all rights, I am ALLOWED to say this. However, just because I am the kind of person I am, I resent being put in the situation where I HAVE to say that. He may be very cool, and that’s fine. The problem is, I signed my name on the dotted line under the assumption that they would leave,and then the house would be mine. I am not so happy about this latest development.