I wasn't online yesterday, so I didn't see your post until now!
What a mess! I've been there done that too! When DH and I lived in our only apartment, we had neighbors that would actually take their fights into the hallway and out the door to the parking lot... right under our windows! They would even get pretty physical at times (well, usually it was the woman getting physical while the guy would do whatever he could to defend himself. ).
One night we finally called the police on them, and got to listen to the entire thing... it was summer and we had our deck door and windows open. As it turned out, the woman was wanted by the police for forging checks at her last place of employment and the guy never knew about it. Funny how things can turn out, huh! They hauled her off to jail and the guy was left to evaluate his relationship.
We felt bad that the poor guy had to find out what kind of a woman he was dating through the police, but happy that we didn't have to deal with the loud fights any longer.
I hope everything turns out ok for you with this! I do agree with what other people have said... I don't think you're overreacting, but you might want to look into moving yourself.
Good luck! Keep us updated on how it turns out!
-------------------- ~ Rachel (IBS-C)
If life hands you lemons, make lemonade!!
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Jeesh!
They would even get pretty physical at times (well, usually it was the woman getting physical while the guy would do whatever he could to defend himself. 
