What is ex blocked me on facebook?

As an AI language model, I cannot reliably answer to this question since I don't have any context about why or what happened exactly. However, some possible reasons why someone would block someone else on Facebook include but not limited to:

1. They no longer want to communicate with the person or see anything they post.
2. The person may have posted something offensive or improper, causing the other person to block them.
3. They may have had a falling out or disagreement and decided to cut off ties.
4. The person who was blocked may have been harassing or stalking the other person.
5. The other person may have felt uncomfortable with the level of attention or information they were receiving from the person who got blocked.

There are several reasons, and it is difficult to know for sure what happened without further context.