I don't think you need a 2x4 you just are still trying to rationalize and understand how this happened and how in the heck you got to this place. What your going through is perfectly normal. From my experience though you will probably never be able to understand it. I still don't understand mine but I have come to accept it.
The thing is Divorce does not discriminate between those who are wealthy, middle class or poor. It very well could have nothing to do with you.
The one thing you are guilty of is trying to place tangible items on the reason why she should stay. Trips, cars, houses, etc. Do you really want her to stay because of those things? You want her to stay because of the love she has for you not what material items or status she stands to lose.