To be paying for everyone on nights out etc or whilst working away, not only would that be a huge amount of people but over a huge amount of time. I think it would be difficult to spend £116K, simply by 'treating people'. No one surely would be taking out bank loans to do this?! Credit cards, I understand but not bank loans. Unless he's used the loans to pay off various other credit cards.
I think you need to find out OP, if your husband is actually still working. I can see someone taking out loans/maxing out loans, to pay for bills etc, because they don't want to admit to being made redundant or sacked.
I'm leaning more towards gambling/prostitutes. You haven't seen anything physically tangible, that he could have spent the money on eg. A car, new tech etc. Therefore, it's got to be something unseen, like drugs, gambling, women. I would have thought you'd have noticed some behaviour change in your husband if it was drugs, but I don't know.
Your husband must have digital copies of the loan agreements/credit card statements. He needs to show you these. He also needs to be 100% honest with you. Unfortunately, if it is drugs, gambling or women, then him being honest is unlikely or it will be minimised.
Are you not on the deeds/mortgage of your home? Is it all in your husband's name? In which case, he could have secured loans against it.
Blaming you and the children for his overspending is ridiculous. He's trying to pass the buck. You need to stand firm. You didn't put a gun to his head and force him to take out credit cards/loans, he made that choice, not you. He's a grown adult, he's responsible for his own behaviour, not you.