Thanks everyone for the input. Glad I'm not the one being unreasonable.
I spent all of today in the library and when I got back earlier it was much more tolerable. I can tell that they're putting in a much more conscious effort to be respectable, which I appreciate. As I said, he's only been here for a month, so I have a feeling this just needs some time to work itself out. People have told them in the past that they can be really annoying, but B & G always just shrugged those people off. I think they're finally starting to understand it after I repeatedly have the same complaints. G keeps stressing how she doesn't want to lose our friendship over this, so who knows what'll happen. I'm hoping things get a little bit better after he starts working next week and won't be around all the time.
As for the rent/living situation, it's pretty complicated and not really something I want to go into here. I realize that it's my fault for agreeing to live with them, but as I said there's more background to the whole story that didn't really pertain to my original question. But, rest assured, if things don't get better in the next few weeks after talking more, I'll definitely be finding a way out all while maintaining civility. I will for sure be seeing G all the time next semester (we're members of the same organization), so I definitely don't want to let this get out of hand.