Kit Harington has been in an on-and-off relationship with Game of Thrones co-star Rose Leslie since 2012, which was also the year her character was introduced to the HBO show. By now, they are definitely "on" and engaged.
These On-Screen Couples Were Also Together in Real Life
Courteney Cox and Brian Van Holt played a divorced couple in the popular TV show Cougar Town. Although the show lasted for a total six seasons, their relationship was unfortunately only good for one year.