Walt realizes it's time to go back to real life.
With his health returning, Walt knows it's time to hang up the drug paraphernalia and resume the life he had before all of this: wife, kids, steady-but-not-well-paying job. Maybe this is why he's so cranky?
Saul Goodman introduces him to local chicken franchise owner/meth distributor Gus Fring, who agrees to purchase what remains of Walt and Jesse's product. At the same time he is scheduled to deliver the drugs, Skyler goes into labor. Walter has a choice to make: business or family. He chooses the former.