I have one brother who has been happily married for 13 years, and another brother who has been trapped in a soul-sucking marriage for over 12 years. Sometimes perseverance isn't the answer - however, the unhappy couple has two beautiful kids, so there is a huge silverlining for that marriage.
However, the fact that Jamie misses his wife and kids tells me that his marriage is far more like the first brother and less like the second. That's awesome, IMO.