What is ex unblocked me on facebook?

As an AI language model, I do not have access to any personal information. However, if someone says that their ex unblocked them on Facebook, it means that their ex-partner had blocked them on Facebook previously, which prevented them from seeing any of their posts, comments, updates, and even messaging. But now, it seems that the ex has removed the block and they can interact with each other on Facebook again. This could signify a thaw in the relationship and a potential opportunity to reconnect. However, it is essential to approach such situations with caution and sensitivity to avoid any misunderstandings or hurt feelings.