Both my BIL were drug addicts.
SIL still is.
She is in total denial.
Both BILs denied it for years, until one ended up in prison (held up a post office to fuel his habit) and this shocked him into stopping drugs. Before this, he didn't even admit he took them.
2nd BIL denied he had a problem, almost died TWICE, went into hospital, lost 6 stone in a few months. Still denied he had a problem, said all the doctors were lying, still drank and took drugs.
His mum moved him out of his druggie circle and carted him off to her house in the boondocks. He was unable to get drink or drugs. He crawled out of her house and tried to hitch hike to the local town to buy drugs. Collapsed...was taken to hospital. The doctor told him it was the last time he would get treated there and if he went unconcious again they wouldn't recussitate him. My niece burst into tears at that point (she is 12) and THEN finally, after 30 years of drug taking my BIL realised he was trashing his kid's lives and his own.
He has now given up.
The thing is
an addict has to admit they are addicted
they have to want to give up
No one else, not wife, mother, child, doctor can tell them this, because they won't believe it. It is awful, but you have to stand and watch and hope they realise it. Or, you get out.
It's really depressing, my SIL still hasn't stopped and her kids live with her mohter as she can't look after them. It is unpleasant.
I hope your DH admits he has a problem and wants to stop.