Darkness is not always bad, just as light is not always good.

Comfort is for the lazy and the ugly." Aphrodite

The guy I'd felt such an immediate and deep connection to I'd thought that just maybe there really were such things as soul mates, and had considered, at least for a few brief moments, that he might be mine.

Its more than a simple belief that there is good and that it should fight the evil in the world. It's a personification of Light and Darkness at their most elemental level, as forces that are so absorbed with themselves that one cannot exist without the other though they constantly try to consume one another. One of the earliest repersentations of Light and Darkness was of Light being a massive black bull and Darkness being an enormous white bull.

He leaned back a little, not taking his arm from around me, but looking into my eyes. “You’re changing, Zoey. And I’m not sure what you’re changing into.

Plus, according to my mother, memories change like people do, especially if there's enough alcohol involved-Aphrodite

Before I could cry or scream I whirled around and stalked to my bedroom,slamming the door behind me. I hope they all drown. "Zoey your mother and I need to speak with you." Great. Clearly they didn't drown.