I really think that Adam was dead set on testing the free agency waters unless the Pats were willing to give him a contract that he and his agent were 100% positive that no other team in the NFL would match. Adam and his agent were probably only going to make a decision after the Free Agency period opened, not before.
It's not a foregone conclusion that Adam will leave us. I think he just wants the market to set the price. I wouldn't be surprised if the Pats would be willing to match a reasonable offer, and by reasonable I mean a contract that will still keep him as the highest paid kicker in the league but not at double the salary of the second highest paid kicker in the league which stands at just above $2 million a year currently.