J.W.
I am just throwing this out there as a possibility. How strict was the budget? I have said this many times, a budget that is too strict is like starvation dieting. You binge in the end. He may be bingeing. The vacation signaled to him the all clear and he is eating everything in sight. If this is the case it will be like reigning it the woman who has the twinkies in one hand the ice cream in the other, notice she growls when you get near.
If this is the case you will need to go with I know you needed this but you need to stop before you get fat/broke. :)
Good luck