Gabe and Erin date over the summer in Season 7. It is an extremely awkward and unorthodox relationship, with Gabe romanticizing it. Erin is obviously not attracted to Gabe but they stayed together due to Erin's politeness
Andy shows jealousy toward Gabe because he "stole" Erin.("Nepotism")Eventually, Erin and Gabe break up, and Gabe leaves and gets fired. Gabe is obviously very attached to Erin, and attempts to win her back several times. He makes an appearance in Season 9, claiming that he got a tattoo for Erin, which was a Nike swoosh.
Status: Broken Up