Sebastian Stan Hints ‘Gossip Girl’ Costar Leighton Meester Was His First ‘Serious’ Love [Video]

Sebastian Stan is looking back at his first time falling in love.

The 42-year-old actor opened up to Variety about his first serious relationship while reflecting on his time on the hit TV show, Gossip Girl.

“It was the first time I was in serious love with somebody,” he shared of experience filming the CW series in New York City. “Walking around the city, seeing these same buildings and streets — life seemed simpler.”

Sebastian Stan and Leighton Meester attend CALVIN KLEIN COLLECTION Hosts PARSONS Fashion Benefit 2009 Pre-Party at Calvin Klein Collection on April 2, 2009 in New York City.PATRICK MCMULLAN/Patrick McMullan

Though he doesn’t directly name his Gossip Girl costar and ex-girlfriend Leighton Meester, the two dated from 2008 to 2010.

Stan — who played Carter Baizen on Gossip Girl — appeared in 11 episodes from 2007-2010.

He’s avoided publicly discussing his relationships over the years, but he spoke highly about Meester during their …