As a loved one who struggled with insanity for ten years, I think it a huge mistake to tell someone it is not him; it is the meth.  That is the insanity of an addict.  Yes, it will change him permanently.  It destroys the brain.  You keep saying you don't understand this or that and so on... big mistake to expect a meth addict to think.  Read the post about what it does to the thinking part of the brain.  Meth makes people animals...period.  There is no brain.  How many years do you want to waste hoping he will think it through????????????  Peace friend.  No contact; no way; no how...................  There are good people on here who have recovered and spent years in a hell of climbing out of the hole. 

find one person on here who said they did it in less than "years" I would love to see it.