I've had males go on hunger strikes for no apparent reason before. From consulting with other keepers, it seemed to be a case of boredom with the menu or preference for a specific item. From your description, this doesn't seem to be the case with your male. Have you tried any roaches, stick bugs, other exotic fair? How about fruit or foliage? Anything to break up the monotony can spur their appetite.
The digging thing may or may not be related. Does your male have enough space? They will dig and pace their perimeter when they feel confined. Can he see the female at all? The distraction of a female is more than enough to put them off their food and cause them to resort to extreme measures trying to get to her. Even a fleeting glimpse or reflection of her will set him off.
Revenge is a dish best served cold...
With a side plate of steaming entrails,
And a nice Bordeaux!