How did The force unleashed 2 end

He got killed from himself(a clone of him stabbed him in the back)

Uh, that's the Dark Side ending which is noncanon. The actual ending was he decided to spare Vader's life and walked over to an unconscious Juno and held her in his arms and when she came to, they finally kissed again. Later, Kota and Juno have a holographic discussion with Princess Leia saying that once the Empire finds out that Vader has been captured, several ships will be launched in order to confuse the Empire as to which one is the actual one to follow. Later, Starkiller confronts Vader who is held on the Rogue Shadow and claims that whether or not he really was a clone, he let Vader live and has finally broken his hold on him. But as he walks away, Vader tells him that "As long as she lives, I will always control you." Starkiller pauses, but doesn't reply, then goes to the cockpit where he and Juno share a moment before heading out somewhere. But they are unaware that the bounty hunter Vader hired to track down Starkiller, Boba Fett, is following them