Nice comments firegirl.
Orthopaedic residency can be very rough with long hours. Chances are, it is not your fiance, but his residency. During my R2 year, I pulled many 130 hr. weeks. It is a mostly repressed year of my life, but I learned a TON. There is no substitute for the exposure you get by being there all the time.
Work hour limitation is an interesting concept. Residency does not lend itself to real-world practices. I would not encourage you to encourage your fiance to make a big issue out of it. The limitations have unknown ramifications for training. If you're not there, you're not learning or getting exposed/doing procedures. How about less hours and a 7 year residency? No thanks. I've got to be moving on.
I am married with two kids and it has been rough for my wife. She is not always understanding, but I understand. Residency can only be experienced - you can't tell someone meaningfully what it is like. I echo firegirl's comments: try to be understanding. Don't blame him. Leave him alone if he passes out.
Good luck on your long distance relationship. It's going to be tough, but hang in there and it will be over before you know it.