He did this last year and came back. He's just shopping for the biggest pay day he can get. Can't blame the guy he isn't going to play in the NBA so if he can find someone to pay him 50k or 100k or something for a season then you have to take it.
This approach has completely ruined college sports in my view but if they allow players to shop the open market every off season for the highest bidder then you better believe they're going to do it