Am I sinful for the actions of my drug-addicted husband, and is divorce better in this situation?

The wife bears no sin for her husband's drug abuse, as long as she disapproves of his actions and does not assist him. It is advisable to strive for his reform and help him repent. If he repents sincerely, she may return to him. However, if he does not repent, it is better for her to separate from him through divorce or khul'.