He only has kind words for the people he worked with on Supergirl, and he even tagged a bunch of his Supergirl pals in the post, including Floriana Lima, who actually left Supergirl earlier in the third season.
As it turns out, Jeremy Jordan didn’t leave Supergirl as a regular due to a falling out with any of his coworkers or because the show ran out of stories to tell for his character and needed to get rid of him.
No, Jordan simply decided that the time was right for him to move on and star a new chapter in his life, and let it be one that allows him to spend more time with his wife while settling on where to go next in his career.