Welcome, sorry that you are going thru this.
I must say "Children First". I know that children hear and see everthing and that parents do not realize it. They are the ears and eyes of the world. Please make your children your priorty.
Your BF is an hard core addict, please do not keep your head buried in the sand.
He is an adult and is responsible for his choices, he is also responsible for his recovery.
Keep posting, read others posts, it will help.