As you noted, the at-will employment doctrine means that either party to an employment agreement can terminate the agreement, with or without cause, with or without notice. Since there is no written agreement concerning the relocations costs, you are under no obligation to pay it back. However, if your conscious tells you that paying back some of the money is the right thing to do, by all means - do it.
Even though the new employer may not "sue" you for the proceeds, they could certainly give you a bad reference. Your reputation may be at stake.
Answered on Dec 17th, 2015 at 6:44 AM