Paul states that divorce is not a typical end for a marriage for Christians. "Now to the married I command, yet not I but the Lord: A wife is not to depart from her husband" (I Corinthians 7:10). The reference to the Lord refers to Jesus' teachings on marriage and divorce. "And I say to you, whoever divorces his wife, except for sexual immorality, and marries another, commits adultery; and whoever marries her who is divorced commits adultery" (Matthew 19:9). Jesus gave only one reason for a divorce which allows the innocent party to remarry and that is when the other person is committing fornication.
There might be other reasons that a person cannot continue in a marriage, but in those cases the person doesn't have the right to marry someone else. "But even if she does depart, let her remain unmarried or be reconciled to her husband. And a husband is not to divorce his wife" (I Corinthians 7:11).
If you believe your husband's drug abuse is causing harm to you or your children, then you can divorce him, but you must understand that it is because living single is better than remaining married. The goal is to eventually turn your husband around so that he might be saved and that the two of you can restore your marriage.
If your husband is sleeping around with other women then you can divorce him because of his fornication and have the right to marry another man.

