If they're not being as inconsiderate as having sex in the room while you're sleeping (people do that - it happened to me), maybe you can set up a schedule. Like he can stay 2 or 3 days a week, and they have to tell you ahead of time so that you can make other arrangements. Maybe not sleeping at someone else's house but you can make plans to study in a friend's room or something so you don't feel so crowded.
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