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I think that Walt returns after his year in hiding with the new identity. He buys the bazooka to rescue Jesse from his enslavement in the meth lab having come to the understanding that Jesse is his true love.
Jesse comes to the understanding that Walt protected him all along and that he let Jane die because she got him back into heavy drug use and was only trying to save/protect him.
They both contact Saul who gets them out of the country with the help of his connection and they live happily ever after running a gay bed and breakfast in Belize.
The end
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