I firmly believe if they had spent at least a year dating, more time together alone (spending most of your time with friends creates a buffer) they would never of made it to engagement point.
It's rather sad they spent so many years unhappy.
LaRae
I agree. Probably one or both of them would have come to the realization that deep down their interests and personalities were not compatible for the long term.
While there was enormous pressure on Charles to marry, it would have been better for both of them to have moved on to other prospective partners.