Alrighty heres my opinion. Yes it would be. His drugs have taken control of his life. He needs prayers and lots of em. ADDICTION my mom once told me, is anything you put before God. So in this, DRUGS are who he is worshipping. So, she seems to have helped him out alot. But i dont know the whole story, sicne things been left out so i cant make a very good opinion. But, Maybe she could like, have it so she has to sign for the meds? Then she can know she gets them. And what bout a combination lock? Then he doesnt have a key to steal.
Stealing, and lying, is agaisnt the ten commandments. So yes i could say it is the right grounds for a divorce.
Alos, if "sexually immortality" is the only grounds for divorce, what if your husband is faithfull, and attnds church, but behind the scenes he beats the wife every day black and blue? Does it mean you have to stay with him since he didnt have sex with anyone else, even iif your life is in danger?