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
Charmed-stars Alyssa Milano and Eric Dane also dated off-screen for a while in 2003. Eric got married to actress Rebecca Gayheart in 2004, they have two kids together but got divorced in 2018. Alyssa married her former agent Dave Bugliari in 2009 and they are still together as well.