Could be he has been inside his own head a bit. Ever had a situation where you planned to do something you didn't have your heart into months in advance and when the day came you decided, "you know what I can't do this?" We have seen guys retire in their primes before for multitude of reasons, Patrick Willis, Luke Kuechly, Terrell Davis, Barry Sanders, Pat Tillman.
Could be he is showing doubt about his commitment to football and the Bears are trying to talk him into continuing his career.
Goldman doesn't come off as a workout warrior with a unquenchable thirst for the NFL. Regardless of what he would be giving up, he has made enough money to live the rest of his life as he sees fit. Maybe that is enough for him.
He very well may show up go to go at TC , but to not see warning signs is a bit naive, as the signing of Pennel proves.