The logic sucks honestly, she draws more attention by avoiding her, it's not like them leaving at the same time means they have to actually leave hand in hand or something. Beyond that, periodically leaving in the same direction at the same time is just... a logical conclusion of both heading the same direction while being friends, if they would just be friends?
Besides obviously with what this series is, they are gonna get closer over time regardless, two people who are close leaving together is just normal. People don't have to have a 'specific type' to go home with one friend more anyways.