A "good marriage" isn't guaranteed to be a desirable one past the wedding day. I am in no way suggesting GP's marriage is a ticking time bomb, but I've read enough stories on Reddit and elsewhere to know there's no such thing as a guaranteed marriage even if you do everything right. My expectation is that GP's or his spouse might possess insight.
People who's marriages I thought would go on till death (Bezos's, Gates's, Carmack's, and most recently Tom Brady's) can have the scales tipped into the direction of "leave for reason X and take what you can from him (and sometimes her) on the way out", whether out of vindictiveness or perceived entitlement, even if the money wasn't the primary cause or objective.
People who's marriages I thought would go on till death (Bezos's, Gates's, Carmack's, and most recently Tom Brady's) can have the scales tipped into the direction of "leave for reason X and take what you can from him (and sometimes her) on the way out", whether out of vindictiveness or perceived entitlement, even if the money wasn't the primary cause or objective.