The couple has been romantically linked since 2012 after meeting on the set of hit fantasy series "Game of Thrones".
The stars only went public with their relationship in April, 2015, but have been open about their affection for one another ever since.
During an interview on UK talk show "This Morning" , the Scottish actress admitted their various work commitments often keep the pair apart for weeks on end, reported Contactmusic.
"It's kind of an embarrassment of riches whereby both of us are working. It's a wonderful thing to be involved and to be busy, but yes, I suppose we make it work, FaceTime is a must," Rose said, admitting the frequent calls often leave her with a costly phone bill at the end of each month.
The show went on to become one of the most successful period dramas ever, but Rose says she had no idea just how popular it would become.
"At that time I was very excited just because it was a gig for six months," she said.
"I'd never been employed for that amount of time. But certainly I knew that we were onto something great, just because of (leading stars) Maggie Smith and Hugh Bonneville. You're like, 'Well you're always going to be surrounded with good drama and brilliant actors.'"
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