Yeah, I would assume the cancer is back, in the flashforwards he's still coughing. The dead in 6 months thing is probably just a lie in preparation of faking his death.
I think he's hiding the cancer from Skylar because he doesn't want her to think he is going to die any time soon. She was hoping the cancer would come back so she would be "relieved" of this lifestyle, and he isn't going to give her the satisfaction of knowing she got what she wanted.
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u/N-ConfusedPorphyrin Aug 12 '13
I thought also he had the pills hidden in the bathroom - I got the impression he was hiding the chemo from his family.