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
Not as difficult to run up as you'd imagine. The OP says £30k is for house renovations, could be more if that's an underestimate. It could also include some family spending that's outside their budget. Due to the increased CoL, many people have seen a significant reduction in their disposable income, literally most of it gone, so if they've kept spending as they always have, that could account for a good chunk of it. Plus if he's been paying for group meals etc, that could be hundreds of pounds a time, although it's surprising that people let him do this multiple times without reciprocating.
But anyway, spending like that, credit cards fill up quickly, so then people consolidate them with loans, and keep on using the credit card. If you don't pay a credit card off in full every month, the interest racks up at 20-30% pa, which alone could double the balance in 4 years.
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
This could also be the reason - I can't see if the OP has said whether he's employed or self employed, but could it be that either way, he's lost his income, ie lost a job or his business isn't doing well and/or he's propping up a business with personal credit?
OP, you mention an IVA, and this is probably a situation where one is appropriate. However, it will effectively ban you both from credit for 6 years where you're forced to live on a modest budget with his surplus (and possibly some of yours if it looks like you've benefitted from what he spent the money on) going to repay an affordable amount of the debt, with the rest written off.
However, he will need to get advice first, which should be from a charity like Stepchange, not a commercial provider who might not necessarily be working in his interest. There's a good Moneysaving Expert forum where you can get more information about the practicalities and read about people's experiences.
IVA & DRO — MoneySavingExpert Forum
IVAs are a serious undertaking and a step away from bankruptcy, so if you decide to stay with him and he goes down this route, he needs to understand it's very much a last chance and any more overspending/irresponsible money management, it's over between you.