If you look at this from an alignment perspective, your character commited an act which was probably not good (I hesitate to call it evil, since there's the 'heat of the moment' arguments and such that have already been made). Given your tendency to be a good person, perhaps it's acts like these that keep you in CN territory instead of switching to CG.
In other words, you could build off the incident for purposes of character development. Maybe your character tries to be a good person, but occasionally just gives in to these impulses she has. It then becomes a struggle to explain and/or justify these 'out of character' moments both to others and to yourself.
It might even lead to some interesting situations down the road if you incorporated this into your character. Perhaps there are parts of the world where people have a decidedly negative opinion of your character, because at some point in the past you gave into one of your impulses and ended up doing something that wasn't just not good, it was Not Good.