Good question! Maybe he is not afraid of losing any assets, but he simply does not need "a marriage" to live an amazing life with a person that he loves. One could turn the question around as well "why would you want to get married?" For many people marriage is not a sacred bond, but just a signed contract, and i personally dont need a contract to love and live a happy life. I need my lady and i to have a certain connection, which no contract can help us create, if you know what i mean.