those are not the only reasons people fake their own deaths.. men will often fake their own deaths to get away from their wife and family because they don’t have the guts to break it off.
Perhaps, but few can plausibly argue that he didn't have guts. And he also had enough money that even if his wife took most of it, he wouldn't be hurting.
By vanishing he'd have access to none of that money. He's even been declared legally dead.
If he had wanted to vanish and start a new life, he would have transferred his assets out of country, and simply disappeared. There would have been no need to fake an accident.