I'm dating a girl that is a D3 at the school from where I graduated. She is not the greatest fan of the distance, or the hours, or the fact that when I get home after a 36-hour shift I'm not always a delight to talk to, or that I never get enough days off in a row to go visit her for a change. She's been taking it all very well, though--much better than I had given her credit for in the beginning. It's a lot easier for me. There isn't a whole lot of time during the 100-120 hours/week while I'm at the hospital to think about her, much less spend time missing her. I see her every four to six weeks, when she flies down to see me, and it always feels like she was just here. The time goes that quickly.
Dental school life: golf 2-3 times per week, lots of travel, going out, TV, sporting events, bar league sports...
Residency life: only fill my gas tank every 3-4 weeks since I live a mile from the hospital, rarely go out since I usually get only one weekend day off, haven't watched TV since I've been here (didn't even bother getting cable or an antenna), played golf once in four months, the only sport that I play is shooting teeth into the biohazard container, the only travel that I get to do is driving to the grocery store or Target occasionally
Life sucks in a residency, but it's only temporary. However, it's great to finally be doing what you like. Any time that I start hating life, I stop and think about my former classmates taking impressions, cutting Class II's, and adjusting partial dentures--cheers me right up. By suffering now by working a ton of hours and getting **** on, you set yourself up pretty darn well for the future. It can be miserable, but it's always tolerable. Gotta stay focused on the big picture...