Former Glee star Matthew Morrison has been fired from the US version of So You Think You Can Dance (SYTYCD) after reportedly sending “flirty” messages to a contestant.

A source has told PEOPLE the contestant was left feeling “uncomfortable” after Matthew, 43, began sending her direct messages on social media.

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The source said Matthew, a judge on the reality TV show, was let go for conducting an “inappropriate relationship” with the female contestant.

“They didn’t have sex, but he reached out to her through flirty direct messages on social media,” the source told PEOPLE.

“She felt uncomfortable with his line of comments and went to producers, who then got Fox involved.

“He was fired after they did their own investigation.”

The source said Matthew never met up with the contestant off the set of the show, but that the messages “crossed the line.”

Representatives for Matthew and Fox did not respond to a PEOPLE request for comment.

On Friday the former Glee star said he was leaving the show after failing to observe “competition production protocols.”

“Having the opportunity to be a judge on So You Think You Can Dance was an incredible honour for me,” Morrison said in a statement.

“Therefore, it is my deepest regret to inform you that I will be leaving the show.

“After filming the audition rounds for the show and completing the selection of the 12 finalists, I did not follow competition production protocols, preventing me from being able to judge the competition fairly.

“I cannot apologise enough to all involved and I will be watching alongside you all on what I know will be one of the best seasons yet.”

Matthew was part of a fresh panel of judges for the show’s 17th season that also included JoJo Siwa and Stephen “tWitch” Boss.

As recently as April 5 he had written on Instagram that he was “thrilled to be heading back to my dance roots as I join the SYTYCD family!”

The actor, dancer and singer rose to stardom in 2010 when he was cast as Will Schuester in Glee, which wrapped in 2015 after six hugely successful seasons.

He went on to record albums, has performed on Broadway, and has appeared in TV shows including American Horror Story: 1984, The Good Wife and Grey’s Anatomy.

Matthew is married to Renee Puente, with whom he has two children, a son named Revel and a daughter named Phoenix.