The object of Plan B is to force the wayward spouse to choose between his family and his addiction. In most cases the choice is between family and the addiction of an affair, in your case it is family and the addiction of drink and drugs. For a while you have allowed BF to think he can have both. So the dragon has grown.

Of course you had to make him choose.

He could still choose his family by going into rehab. You might decide not to take him back afterwards but it would still be of benefit to your children to have a functional father.

3 adult children
Divorced - he was a serial adulterer
Now remarried, thank you MB
(formerly lied_to_again)