Peyton Manning would like to apologize to everyone for taking over 12 days to make a major career and life decision. Manning realizes that what is important is not his own fulfillment, or his employer's goals, but the strained patience of fans/Twitterati. Manning also realizes that multi-million $ decisions are best made hastily and apologizes deeply for being so old fashioned.
He also apologizes for being in such great demand, and knows it is his fault we find all of these suitors and coverage so annoying. Manning also "gets" the comparison to Favre, even though he has never feigned retirement, and this is March, not July. But they are both QBs. In short, Manning is really, really sorry for taxing our attention spans and forcing us to obsesses ceaselessly over his decision.