However during the episode it was revealed that the cup had been slipping in and out of the grooves of the mouth guard.
In the episode New York Blaine tells Kurt that he loves him for the first time, to which Kurt replies that he loves him too.
The couple break up in The Break-Up, but they started dating again in Love, Love, Love, where Kurt accepts Blaine's marriage proposal.
In New New York, Blaine moves to New York to live with Kurt, but they soon realise that their relationship is stronger if they live separately, and he moves out.
In The Break-Up, Blaine surprises Kurt by showing up in New York early.
During Blaine's acoustic performance of Teenage Dream, he becomes very emotional, which Kurt notices.
They have been dating for over a year, their one-year anniversary was on March 15, 2012.