@Skipp Not immediately, no. They can last for a year or longer but they will rarely eat and slowly waste away. Try offering food anyway and you can leave the prey in with him for a few days since there is no chance of a molt. He may eat it just because it annoys him in the end.
Perhaps you aren't aware but male GBBs are in high demand, I'd find someone on this site to do a breeding loan with. If the pairing and sac are successful you'll not only have a replacement for him but some slings to sell or trade.