The Glee star was first linked to Broadway actor Stockman in May 2010 and the pair will reportedly continue a friendship following their recent split.
"This is not a dramatic breakup, the relationship just ran its course," a representative for Michele told E Online.
"They are still friends and will always be friends."
In May, Michele revealed that she saw several similarities between Stockman and her father as they shared a caring nature and a similar sense of humour.
Last year, she insisted that she did not have a crush on Glee co-star Cory Monteith, saying that he is more like a brother to her than anything else.
> 'Glee' Lea Michele, Chris Colfer interview: Barbara Streisand should not be a guest star
Watch a clip of Lea Michele and Vampire Diaries star Ian Somerhalder at the Primetime Emmy Awards 2011 below: