I didn't decline, she was my main interest all along and I was angry because my MC kept clinging to Megan and avoiding her despite of me actively acting and saying otherwise when possible. Only when the game forced me to cancel plans with her I focused on other girl, with the consequences you all can imagine.
My point is that maybe we could sense something was off with her, but nobody was expecting THAT. That game broke some common grounds for the genre, in this case the crazy bitch being actually crazy and not just a wild, fun and easy hook up. So now it's only logical we see ghosts in every dark corner DPC puts upon us. And boy, does he like to do so.