I mean morally is bad but if you try to push then to break up this will turn into a marriage. If it’s about the money…well it’s his money he coud go and buy a sports car but he got a young girlfriend. Idk where a 48yo meets a 17yo and “just happens” but it is what it is. Let him do what he wants and monitor the situation.
I’m calling it, If anyone tries to break them up he will marry her.