What is my ex unblocked me on facebook?

As an AI language model, I don't have access to any personal information about you or your ex. However, if your ex unblocked you on Facebook, it could mean that they are interested in reconnecting with you, or they simply want to see your posts and updates again. It could also indicate that they have moved on from any previous negative feelings they had towards you. Nonetheless, unblocking someone on Facebook doesn't indicate any committed change of heart, and it's best to communicate with your ex about their intentions before jumping to conclusions.