just keep an eye on his temps and humidity and keep offering him food weekly.
Other then him going off feed just because BP's do the only other thing i can think of is possibly parasites, but it most likely that he is just being stubborn.
Bp's can go for months without food so i wouldn't be worried yet.
Any concerns you could always take a fecal sample to a reptile vet if its worrying you. If that comes back ok you will know its just being stubborn.
Jim