People often forget about the side stories in major plots and knowing that Spider-man will be in Civil War excites me because that was the biggest and most important aspect of civil war.
He trusted Tony and believed him when he said that registering would be the right thing to do. Peter struggled with the decision but Tony guided him to reveal his identity on national TV. He created a spider suit for Peter that he could control. He abused his power and when Peter realised his mistaken morality you know what happened? Read spider man civil war, back in black and one more day.
Spoiler alert for those that haven't read it.
King pin hired a sniper to take him out and Aunt May was shot instead.