Mercier, you truly are caught between a rock and a hard place.
I am requoting Lego's [its early and posting with the start of a migraine so I am sorry if I have misremembered the author in the last page] I am requoting because this is so important.
The first describes the state of my son. Yes he trashed my kitchen, yes he had a plan ready to act through to set his school on fire, yes he was a hysterical sobbing wreck when the can of worms finally popped right open BUT....he did not like thinking and feeling as he did and he did not know anyone could help make any of that better. When the Psych's saw him he was given the choice of agreeing to a voluntary section or they would have no choice but to involuntary section him. He had just enoough self awareness left to agree to the first. At no point did he turn round and make out it was all my fault he felt and was thinking as he did. When he lost it in the lead up he smashed up things rather than people but he was becomming increasingly concerned he would end up hurting people due to the none stop codeming thoughts he was having.
My brother choose the other route. Is an end stage alcholic who has ruined his own life, my parents when they were too frail to withstand his bullying and manipulation and just about everyone else he has come in contact with...with the exception of his equally horrible drinking buddies. Its everyones fault but his, he does not engage with help and is an utter arse who I refuse to let near my kids. My eldest son says he is the reason he choose to work with the help offered. He did not like the look of his uncles life choices.
If need be seek advice and support from social services to protect your children from the unreasonable behaviours. If he is capable of engaging with stat' health services they will simply act as a support. If this is the start of the kind of long term manipulative behaviour you would not want around growing kids they will be able to spot it.
You know your husband and your kids. Ask yourself at present which of these two bunnyholes he has choosen to head down then if you need to act to portect your children. The desires and wants of an adult experiencing any form of mental health problem does not outweigh the rights of a child to be protected from them. A caring unwell parent will know they are not right seek and work with help. An arse will inisist its everyone else problem but theirs.
One had had a nervous breakdown. He told people this and he told people his limitations caused by his anxiety, eg couldn't do busy transport, couldn't do presentations, needed to be near a loo. He took every bit of help he was offered, counselling, etc. He worked hard at getting better. He was a top bloke who had had a really hard time. He did improve massively over time.
The other guy refused help, felt sorry for himself, was a ginormous arsehole, ended up becoming abusive as a result of his anxiety. It sort of turned delusional, helped by alcohol i think.