The "GoT" actors met on the sets of the show in 2012 but reportedly split a year later. They later reconciled and officially confirmed their relationship in 2016 at the Olivier Awards in London.
In an interview to Vogue Italia in 2016, Kit Harington recalled falling in love with his on-screen lover, while filming "Game of Thrones" in Iceland.
"Because the country is beautiful, because the Northern Lights are magical, and because it was there that I fell in love. If you're already attracted to someone and then they play your love interest in the show, it becomes very easy to fall in love," Kit Harington said.
People magazine also quoted a 2014 interview Leslie gave in which she described Kit as "a lovely and funny man, and a dear friend."