Is AUTHOR wrong in the post ? POST : My boyfriend and I have been living together for 3 years (in communal/flatting style places), 6 months ago we finally got our own place together, just the 2 of us and it's been great.  Anyway recently he had his best friend move in with us because he got kicked out of his own place and had nowhere else to go.  I was under the impression (from limited talks because my partner's not great with communication or organization, and this all happened very suddenly.. like within 24 hours suddenly) that the friend would just be crashing with us for a week or two while he found somewhere to live.  But the next morning the guy turns up with all of his worldly possessions and fully moves in, he's been here since and it seems like he's here to stay.   My boyfriend is pretty happy with the whole setup, he admitted he sometimes missed having other people around when it was just us, and he's loving getting to spend so much time with his best mate.    
I'm not handling it well though, I like the guy and it's nothing personal, but I really don't want him living here.  My issues are that I have pretty severe social anxiety issues, and now I'm anxious all the time because there's always people around. (they bring other people around daily too)  He spends all of his time in the living room (he doesn't work or study) with his volume turned up loud watching youtube/anime/playing games or playing guitar.  I've ended up just spending most of my time in bed because I don't want to go out to the living room.  He doesn't pay any rent or help out around the house in any way, he doesn't even clean up after himself.  This is a really small house too, with only 1 bedroom so he's converted the entrance way into his bedroom.  The living room is full of all of his furniture and stuff, so I had to move a lot of our furniture and stuff into our bedroom to make room for him.. so now every room is basically a narrow track between stacked piles of stuff, and it's a pigsty because I can't keep up with the cleaning on my own.    
I've spoken to my partner about all of my concerns, he doesn't want the friend to move out but said he will ask him to leave if I reeaally want him to.  He's tried asking the friend how long he's planning on staying here but he hasn't got an answer.    
Is there any way I can resolve this and salvage my own sanity in a way that would make me less of an asshole?