KURT & BLAINE, SEASON TWO
First Meeting, "Never Been Kissed": Kurt goes to rival school Dalton Academy posing as a student to spy on their glee club and meets Blaine, the handsome star of the Warblers.
First Duet, "A Very Glee Christmas": Kurt and Blaine perform "Baby, It's Cold Outside" together.
First Kiss, "Original Song,": After seeing him sing "Blackbird," Blaine realizes he's in love with Kurt and the two share their first kiss soon after.
KURT & BLAINE, SEASON THREE
Sexy Time, "The First Time": After a performance of their school musical West Side Story, Kurt and Blaine lost their virginities to each other.
KURT & BLAINE, SEASON FOUR
Break Up, "The Break-Up": While visiting Kurt in New York, Blaine admits to cheating on him during their long-distance relationship. Kurt is destroyed and they go on an indefinite break.
Current Status: The two remain close friends, but Kurt is dating a new guy, Adam. Blaine is still heartbroken over their split and may have feelings for Sam.