Star-Lord (Chris Pratt) previously had a catastrophic meltdown before the one with Thanos (Josh Brolin) in Guardians of the Galaxy Vol. 2, he was correct. In the aftermath of the Avengers' failure to defeat Thanos in Joe and Anthony Russo's 2018 film, Peter Quill received an enormous backlash for his meltdown. However, letting his emotions get the best of him is actually one of his prominent characteristics - something that fans have seen him do prior to the race for the Infinity Stones.
Infinity War brought together the Avengers and the Guardians of the Galaxy in the hopes of stopping Iron Man (Robert Downey Jr.), Doctor Strange (Benedict Cumberbatch), and Spider-Man (Tom Holland) on Titan that they would once again come face-to-face with Thanos. The ragtag team hatched an elaborate plan to swipe the Gauntlet from the villain, but just when they were on the verge of pulling it out of his hand, Star-Lord realized that Thanos somehow murdered his own (adopted) daughter. This led to Quill letting his emotions get the best of him with an epic meltdown that gave the villain the opportunity to escape from the trance that Mantis (Pom Klementieff) put him in, resulting in the crew failing to secure the Infinity Gauntlet from him.
Star-Lord's outburst wasn't uncharacteristic of him, however. Fans have already seen this type of breakdown from him in Guardians of the Galaxy Vol. 2 - albeit a justified one. After meeting his biological father, Ego the Living Planet (Kurt Russell), Quill was quickly enamored by him - thrilled at the idea that his dad is a powerful being. Despite the red flags pointed out by his fellow Guardians of the Galaxy , he was blindly in love with Ego. Fortunately, Star-Lord slowly realized what his father was really about leading to their one-on-one battle wherein Ego itted to implanting Meredith Quill (Laura Haddock) with cancer, essentially killing her. This set off Quill. He immediately started shooting at his father without really thinking much of strategy or consequences - reminiscent of his actions in Infinity War, only at that point in time, there was so much more at stake.
While Ego was pretty much the same as his meltdown against Thanos. The only difference is, the former was called for - Ego even provoked him by dropping the devastating confession about him killing Meredith, while the latter just couldn't come at a worse time.
Overall, while Star-Lord's breakdown definitely played a significant part in the Guardians of the Galaxy Vol. 3 in the pipeline, fans can expect some sort of redemption arc for Quill so as to make up for his Avengers: Infinity War blunder.
