Bp's sometimes go on hunger strikes, reasons could vary, sometimes they just dont feel like eating, sometimes it could be stress from their environment/enclosure (temps/humidity etc).
But they will survive not eating for a couple or a few months, just make sure to offer every week. But watch out for drastic weight loss (need a scale for this, 5000g scale recommended) and watch if the stomach looks like its sucked in, means your snake is definitely starving to death and then you have a problem.