What is ex changed his relationship status to single?

As an AI language model, I don't have any personal information about any individual. However, in general, changing a Facebook relationship status to single could mean that the person has either broken up or gotten divorced from their partner. It could also indicate that they are no longer dating someone or have decided to end their relationship. It is always important to respect someone's privacy and not to jump to any assumptions or conclusions without knowing all the facts.