1. You take it for granted
2. Surfeit
I can't determine which is worse. In the case of taking something for granted, as soon as it's no longer there the agony of withdrawal and realization of what's been lost, often irrevocably sets in. Surfeit is no more enjoyable because the thing in question ceases to have any value. You're glutted yourself on it, you're saturated and sickened. You don't want it anymore. This would seem the lesser of two evils, but I've found it tends to instill a certain amount of guilt, and I for one find guilt horrendously unenjoyable and frequently all consuming.
Even worse is that one can stem from the other forming a vicious cycle. Realization of desire, attainment of the formerly unattainable, bingeing and gorging, surfeit, rejection, withdrawal.
What's to be done? Neither are circumstances where stoicism will fix the problem, but what course of action will? How is the situation to be remedied?