Cat Deeley has taken to Instagram following her colleague Matthew Morrison's shock exit from So You Think You Can Dance.It was confirmed last week that Matthew was leaving the show after not following “competition production protocols”. "Having the opportunity to be a judge on So You Think You Can Dance was an incredible honor for me. Therefore, it is my deepest regret to inform you that I will be leaving the show," Morrison said in a statement shared with PEOPLE."I cannot apologize enough to all involved and I will be watching alongside you all on what I know will be one of the best seasons yet." Now, further details have been revealed about Matthew’s sudden departure with a source close to the Fox reality show telling PEOPLE that the 43-year-old was fired from the series "after he had an inappropriate relationship with a female contestant".“…He reached out to her through flirty direct messages on social media," the source added.