The biggest problem with this conversation is the assumption of static requirements for satisfaction, which just isn't the case. Everyone is different.
Problem number two is most people assumptions of successfulness and happiness are far screwed from reality.
Picture some GQ looking dude, smiling from ear to ear, hopping on his private jet, slaying puss all night, after working all day as the big swinging dick of the hedge fund he manages.
Happy and successful is how most people would portray him. It's the same guy that does unimaginable amounts of Coke just to "enjoy" his so fucking wonderful life, and also the guy that usually eats a self inflicted 12 gauge sandwich when things get tough.
The picture looks a little different now.
The easiest way to know what is important is how you would act if it were gone.
Personally, I could lose my job, my money, my cars, or any of my possessions and get over it.
Obviously my kids are the most important thing to me,... And really what drive me to even do anything
I lived without my wife for a while, and although I made it through it,... I found out the hard way that she was more important to me than one night stands.
And this is coming from someone who probably has some stories to rival yours.
Again, marriage isn't for everyone.... And some marriages need to end, as they are unhealthy for both parties. But don't look at it as black or white,.. And honestly don't get anyone elses opinion. Only you know what's right.