Which 2014 superhero film sequel sees Peter Parker grapple with his dual life as Spider-Man while facing off against new villains like Electro and the Green Goblin, all while struggling with his relationship with Gwen Stacy?

The film you are thinking of is The Amazing Spider-Man 2 (Review), released in 2014. This sequel to "The Amazing Spider-Man" (2012) continues Peter Parker's journey as he navigates the complexities of his extraordinary life as Spider-Man and his personal life as a high school graduate. He grapples with the promise he made to Gwen Stacy's father to keep her safe by staying away, a promise he finds increasingly difficult to uphold due to his deep love for her.

In this installment, Peter faces new and dangerous adversaries. Max Dillon, an Oscorp employee who idolizes Spider-Man, transforms into the powerful villain Electro after a bizarre accident involving electric eels. Additionally, Peter's childhood friend, Harry Osborn, returns to New York and, after inheriting Oscorp and being diagnosed with a genetic disease, becomes desperate for Spider-Man's blood, believing it holds a cure. When Peter refuses, fearing the unknown consequences, Harry injects himself with a spider venom serum, leading to his transformation into the Green Goblin.

The film culminates in a series of dramatic confrontations, where Spider-Man must battle both Electro and the Green Goblin. Gwen Stacy, portrayed by Emma Stone, plays a significant role, often assisting Peter with her intelligence and bravery, showcasing a strong partnership in their relationship. Her presence adds a poignant layer to the narrative as Peter struggles to protect her amidst the growing threats, ultimately leading to a heartbreaking climax that profoundly impacts his life as Spider-Man.