Ok. Let me preface this whole thing by saying I'm married, happily, for 12 years now. I have two children (7 and 10). Before my husband and I were married, I was in paramedic school and working full-time. He got a job 300 miles away. His only job offer. He took it, I couldn't go with him 'cuz I was in p-school. Me dropping Pschool was absolutely out of the question for both of us... it was important to me, and thus, important to him. Likewise, his turning down the job offer was out of the question - this was the start of his career and the offer was pretty darn good.
So, he moved out. We both took a weekend and found him an apartment. He took half my furniture to the new apartment. I was so busy with a full-time job and p-school; he was incredibly busy with shift work. We spoke for only about 5 or 10 minutes every few days, and neither one of us had a cell phone at the time. Did we consider breaking up? Yes. Did we actually split? No. We both decided there wasn't anyone else better out there. I recall I had one day in about two weeks where I was spending the night at home (most of my nights were taken up by clinical hours) and he drove 6 hours, in a snowstorm, slid off the road twice, to watch me sleep for about 2 1/2 hours before he had to go back to work. Hard? Yes. But it made our relationship stronger, and each other stronger individually.
Fast forward a few years. I have two small children at home, including an infant. He gets sent off to a school for 4 months, from September until about 2 days before Christmas. I took a leave from my job since his work wouldn't pay for a family place, just an efficiency one-room for him. Was it lonely? Yes. Did it totally suck when both the kids got the flu? Yes. Did it suck worse when I got the flu after the kids were healthy? Oh, yes. And let's not even start about how lonely it was through the holidays without my husband, best friend, life partner, soulmate, and other half of every breath that I take. Did it make our relationship stronger? Yes. Would I have it any other way? No.
Now fast forward some more. I get hurt, go back to school. He manipulates his job hours and I manipulate my school schedule so we don't have to pay for day care. I get into med school. He is so thrilled, and absolutely willing to leave his career, our house, our friends, to go anywhere on this green earth for me to follow my dreams (besides he gets to retire early!). Are we a bit scared? Yes. But we say often: "together..... anything."
I tell you all this to let you know it can be done. Separation is hard, but if the relationship is meant to be it will survive. It can make you stronger; the biggest strengthener a relationship has is to support each other as you follow your dreams and aspirations. What kind of a wife would I be if I didn't support him in what he wants to do? Do I really want to be married to a guy if he didn't support me in what I wanted to do? Don't lose sight of yourself for the sake of giving up all you are, all you want to be, and all you dream of for him. A good relationship should survive, thrive, and grow. For us, lack of distance is not the definition of a relationship.
It is a difficult decision you make. Make it with care and great thought, but don't lose sight of yourself in the process. Good luck.