<human>: Can you condense the text into a few key points?

Ok, so here's the situation, and it's kinda long, so buckle in:

A few months ago, I moved into a 3 bedroom apartment in Atlanta with some roommates and all was well for the first four months or so. Well, on the fifth month, roommate A decided it would be a great idea for his girlfriend to move in with him, into our already cramped apartment. He said she'd be able to alleviate us with some of the rent and utility payment, so we thought, sure, why not?
Two months later, roommate B decides it'd be a great idea to move his brother in for a little bit since he was struggling financially. Here's the thing though, he didn't bother to tell ANYONE that he was moving his brother in. 
Aside from all that, roommate A's girlfriend hasn't paid any money towards costs, and roommate B's brother has turned our living room into his own place with his own furniture taking up space. Not okay.

All of this said, I'm wanting to make like a tree, and get out. I can't take this invasion of space and privacy, not to mention that I seem to be the only one who cleans the place. That's not my only reason to leave, but right now my main concern is finding out how to get out of here legally.
No one else is willing to break the lease, and I'd rather not sublet to someone I don't trust.
<bot>: Trying to escape apartment lease because I can't take everyone not giving a crap about rules and whatnot. Wat do?