In Season One, Jacob develops a crush on Quinn, but she doesn't return his feelings breaking his heart and temporarily ending their friendship as Jacob felt it was hard to just being friends with Quinn, but she apologizes for hurting his feelings and they become friends again. After Jacob had dropped out, Quinn realized she'd screwed up and decided to ask Jacob to come back. In Season Three, after Jacob started dating new girl Claire Summers, Quinn became jealous of their relationship.
After refusing to join the Glee club, Rachel told a lie to Will that he was dying, which then forced Will to make Jacob join, but he eventually caught her and left the group.
Santana was Jacob's best friends from his early childhood,
Jacob relationship with Claire, is the most complex, compared to his others with his friends Quinn and Santana.
- His nickname "Klubba" is a reference to the character Klubba from the Nintendo game Donkey Kong Country 2: Diddy's Kong Quest.