New Zealand Law
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Once your partner moves in with you, after you have been together for more than three years the Property Relationships Act gives him an entitlement to a half share of property. Unfortunately therefore he does have a claim to half of the property, and you would have a half share claim in any relationship property which he has, which would include things like his cars, tools of trade and Kiwisaver. Even if the property was always in your name, the only way in which you can exclude the operation of the act, is to have a contracting out agreement. I would suspect from your question that you do not have an agreement.
Once the money has been spent you cannot make a claim to it any longer. But if he is content with a payment of $20,000, you can enter into a binding relationship property agreement, which would settle all claims for payment of that money. To make an agreement binding each of you needs to get independent legal advice. But once this has been done and the agreement signed and witnessed by the lawyers, that is an end of his claims.