<human>: **Here's some background:**

My roommate is a good friend of mine and so is his girlfriend. At the beginning of the semester she would spend a lot of time in our room and she would sleepover often as well, but back then I was fine with it. She doesn't sleep over quite as often anymore, but she is in our room more often than her own and it's getting to the point where I feel like it's not even my room anymore. When I get back from the shower, she is there. When I get back from class and I want to take a nap, she is there. They are both my friends and I don't want to sound like a dick by saying that she can't come over anymore (or at least not to the point where I feel like we have a 3rd roommate). 
**So the real question is, how do I talk to my roommate about this without making it seem like I'm saying that she can't come over anymore?

Give me a shortened version of the text
<bot>: Roommate's girlfriend spends too much time in our room. Doesn't feel like my room anymore. I want to let my roommate know without making it seem like I don't want her in the room at all.