I've heard about BP fasting for weeks and even for 6 months but you don't have to worry about that, but if you have a VET that you can bring your BP to it is best and advisable. In my opinion, you can try to offer him a smaller meal/prey, maybe he is intimidated with the size or the temperature of your enclosure is not right. You can also stun your prey and let them smell their food maybe this will help. Maybe your BP is intimidated with its food. When BP pass for their scheduled meal try offering it to them after 4-5 days. I'm not sure about this, but you can try. Hope this helps!