Edited from another post.
I'm in a LDR and have been for about 2 years - I moved about 2 months after meeting him to go to grad school. And for 4 months, he was in the US and I was in Australia. Additionally, I traveled for 4.5 years for work while working mostly with men and saw the patterns in the relationships that strengthened with the traveling husbands, and those that sputtered and fell apart. And the key is communication.
I believe LDRs are always hardest for the person at home. The person who's moving away is going to be a in a new city, experiencing new things with new people.
Communication becomes tantamount and how you communicate will often become more noticeable than what you communicate. In my last long term relationship, I traveled 5 days a week for work and was home Saturdays and Sundays. And eventually it fell apart. Over time, the shift in our conversations went from
- "How are things, what'd you do today" to
- "I miss you, I want to see you, when do I get to see you" to
- "Do you miss me, do you love me" to
- "How come you didn't text me, how come you didn't call me when you said you would".
And the last two are bad places to be. Once we made the third transition, I was in in a pattern of avoidance rather than excitement when it came to communicating with him. I've seen MANY a LDR fall apart because the person away got tired of carrying the emotional weight of the feelings of sadness and "missing" from the person at home. Working with a bunch of men, I got to see the one's who looked forward to talking with their wives/girlfriends and those who avoided their SO's and it ALWAYS came down to communication.
Also, don't be afraid to have direct conversations about boundaries. Agree on and establish them up front so that neither of you are operating on assumptions.