Walter told Saul that he had decided to wash his car to launder money. Saul took him to a store where Jesse was hiding.
Jesse and Walter discussed a way out, and Jesse suggested that the two of them flee together. Walter was unwilling to abandon his family.Walter realizes that the only way he can survive is by killing Gale.
Walt hopes Jesse can help him kill Gale, but Jesse is unwilling.Walt ordered Jesse to follow Gale and get his home address, and Walt went to deal with Gale himself.
Walter was taking care of his children at home, when Gus's men showed up at his door and took him away.Walter knew that Gus had discovered his plan, and at this time he claimed that he would hand Jesse over to Gus in exchange for his life.
While Walt was calling Jesse, he took the opportunity to ask Jesse to kill Gale.Jesse knocks on the door and enters Gale's house, and immediately shoots him dead. Gus' men immediately rush to Gale's house.