Once you are a monk you cannot un-monk yourself. If you can, you were never a monk to begin with. If you believe that you are a “former” monk, stop kidding yourself. It seems to be a trend to spend a year or two at a monastery somewhere and come back to teach the rest of the world how enlightened you have become. May be make a buck or two and get your 5 minutes fame. Nothing wrong with that but I don’t agree that one could ever be “former” monk.
Monk is not a job title. It is a state of mind. Being a monk is not like being a president or a store owner. Once you truly acquire that state of mind, how is it possible to go back?