Wait a minute. That kinda coincides with when Star says that you can change your mind about things in Sleepover. She changed her favorite color because of how she was feeling at the moment, then proceeded to say "Sometimes you don’t know what you think. Your head and your heart disagree. You think you know how you feel about something. But then it changes"
Is this some way of foreshadowing that he's going to choose a different "color"?
Also, speaking of Sleepover, Marco is self aware enough to realize he may be putting Jackie on a pedestal. Which means he may be self aware enough to realize if he made a mistake by bringing her into danger, which has become a huge part of his life thanks to Star and her antics.
I wonder if the inevitable return of evil Marco will make Jackie or him think twice about pursuing a relationship. What if evil Marco inadvertently hurts Jackie? What if the both of them realize that Marco can never be the safe kid and live a normal life with Jackie ever again? What if Marco realizes everything he now has to give up in order to live the "safe kid" life with Jackie that he's had expectations for most of his life? What if this show becomes way too feelsy and becomes way too far removed from its original premise of inter-dimensional mischief and humor? Who is Eric Cartman's Father?