There are several issues to consider here. Is your husband doing drugs currently? Do you or did you do them together? Changes in behavior are difficult to manage and often when someone stops an addictive behavior, it impacts the entire family.
Before you make any drastic changes, I'd suggest finding an alanon support group or investing in some counseling for yourself and perhaps for your husband too.
Does your husband want the marriage to work? Do you want the marriage to work. You need to look inside yourself and decide what you truly want. This is a fundamental question. If one or both of you doesn't want to stay together, then there is no point. If the marriage is worth saving, then you will both need to work to regain the lost trust, support, and friendship.