OK, well, lets talk about illegal. Mailing controlled substances through the mail is a federal crime constituting of several different charges: interstate trafficking, mail fraud, receiving a controlled substance..the list goes on.
Do not talk to him. Do not have any contact with him. If you dont' have a lawyer get on ASAP. Quit letting him jack with your head girl, you are smarter than that. And get divorced quick before he gets busted and there goes all the property you might have gotten in the divorce. (seizure by the feds)