Joe Jonas: Hitting Delete On Gigi And Zayn

Joe Jonas just did the bro version of drowning your sorrows over an ex in a tub of ice cream -- he gave Gigi Hadid and her new man Zayn Malik the dreaded social media cold shoulder.

Guess Joe's seen enough, since he tapped the unfollow button on Gigi's IG over the holiday weekend -- right after Gigi and Zayn made their new romance pretty darn official.

The IG diss went further ... fans noticed Joe also deleted a photo of himself with Zayn and Kanye West he'd posted in June. The caption simply had read #squad.