Hi OP,
First the drug thing is a side issue. This is about the usual roots of abuse...Power and Control. It’s all there in Lundy...and you will find him in there somewhere.
You are in an abusive relationship. He will not change. And yes, you need to get out of this relationship for your sanity and you and your choildren’s future happiness.
sendinthewolves said exactly what I was thinking as I read through the thread, which was ‘she is looking for permission’. You don’t need permission, and you don’t need to justify yourself. You do not need to be vindicated. You do not need to ‘present’ a case. This is not a court of law. This is merely you responding to the fucked up dynamic he has imposed on the whole family. Obviously you know that he expects to allow or disallow whatever is proposed in your family’s life, because he is the tryrant who can make things really nasty if you go against him. But this is an abusive family life, ruled by an abusive man who is happy to punish those around him if he doesn’t get his own way.
Like pudding says, it is a complete mindfuck and he doesn’t have to do much any more to remind you to watch your step. You are fully groomed...so he doesn’t have to terrorise you completely, shout in the street or drive like a psychopath to make you feel exactly the same. That dread you feel? That’s your training. And your training is also telling you that you need to provide a convincing case to convince him to ‘allow’ you to dump him. Good job you don’t need his consent on this one because he would never give it.
Go see a solicitor in secret. Not just any old solicitor...get one who can tell you that they have dealt with abusive respondents. An average family solicitor may be tenacious and diligent, but dealing with an abuser....as mine had to...takes it to another level of obstruction and shiftiness. You need someone who can anticipate this. He or she may advise you not to leave the marital home. If you’re lucky your H may choose to leave in a great big huff or whatever...softly softly catchee monkey.
Yes, get your ducks in a row, but not for him...for you. Good luck. He won’t make it easy but I think you know you have to do this, while you still have the strength of mind. He will have whittled away at your sense or normal. He’s twirled you round so often you think you don’t know which way is up... don’t doubt yourself. Best thing for this would be to tell some real life friends...they will support you and validate/bear witness to his cruelty and help you get clarity.
Get RL support, and get a strategy together with your solicitor. Your H will try anything to undermine you...either be being all ‘nice’, or playing the victim or just white hot anger and threats (telling people you’re an unfit mother - my ex regularly threatens to write to the kids’ GP/school etcto tell them I am unfit, but it’s all just bullshit. It doesn’t frighten me anymore, but it used to.) He will be outraged and try everything to punish you...expect that and stand firm. Make sure you have a friend or supported to phone when you are feeling weak. Makes all the difference.
I promise that when you get out the other side of this, it will be worth it.