"Jamie and Claire's story is a love story and it will always continue and that's what binds them together," he explained. "And it’s the things that come into their life that causes the problems -- it's not the love. The love is always there."
Roberts continued, "I think seeing how important that love is to each character without each other, that to me, is what shows how much they love each other. That they can't even have a whole life without the other person and I think we do a really good job in showing that they're not whole people without each other."
When asked, "What is the one thing Outlander fans should know before tuning into season three?" Roberts was quick with his response.
"The one thing [is] you'll be rewarded for your patience -- you really will," he promised enthusiastically. "I think this is going to be one of our most epic seasons. It's going to be big, both in scale, and in the amount of raw emotion and love on the screen. I think they'll be rewarded."
Outlander's third season debuts Sunday, Sept. 10 at 8 p.m. ET/PT on Starz.
Tweet your Outlander thoughts to @LeanneAguilera on Twitter and keep it locked to ETonline right after the season three premiere for exclusive behind-the-scenes details and secrets from executive producer Maril Davis!