What is he changed his relationship status to single?

As an AI language model, I do not have information about a specific person's relationship status. However, changing one's relationship status to "single" typically means that they are no longer in a committed romantic relationship with another person. It could be due to a mutual decision between the two individuals or a result of a breakup. Changing one's relationship status on social media platforms like Facebook or Instagram is a common way to inform friends and family about the change in relationship status.