Is the romance between the characters played by Darren Criss and Chris Colfer on Glee over?

On Thursday's episode of Glee, titled The Break-Up, a couple calls it quits, and a video preview of the episode suggests it could be Blaine (played by Darren Criss) and Kurt (Chris Colfer).

Season 3 ended with Kurt graduating from McKinley High, leaving boyfriend Blaine behind.

This season, Kurt joined Rachel (Lea Michelle) in New York City, where she is pursuing her dream of becoming a Broadway star.

Glee co-creator and writer Ian Brennan earlier said that separating couples was a theme the show's writers wanted to explore.

“For some of them it's going to work, and for some of them it's not going to work,” Brennan said at Comic Con.

In the clip, a tearful Blaine is seen singing Teenage Dream to Kurt at a piano bar in New York City. (The video is embedded on this page. Visit our video library for more videos.)

The clip also includes Finn (Cory Monteith), which could suggest a Rachel-Finn breakup.

Also separated by distance are Brittany (Heather Morris) and Santana (Naya Rivera), the show's lesbian couple.