In the uk, maybe elsewhere as well, it’s not just financial contributions made that would entitle him to the house etc. Her money will be protected to an extent, but the property won’t be, even though they aren’t married and if only her name is on the property, the partner can lay claim to (maybe not 50%) of the property due to Labour and money he puts in, time is also taken into account in that not just a financial contribution. He also left his job to support her, I am 100% convinced that a big part of that is so he gets a wage from her income and then they have at least one salary in a lower tax bracket but the household income is the same so I would assume that complicates things. When you get in a serious relationship, move in, have babies, buy or renovate a property you’re lives are tangled, similar to marriage the law has changed to protect people who don’t get married almost as much as those who do, he probably wouldn’t be untitled to any of her money from trusts etc but would potentially be from anything she’s earned while in a relationship. But that’s if they go to court if they split he may be nice and just walk away, as long as any money he invested he gets back.