What is why did my ex block me but not his other exes?

It's impossible to know the exact reasons why your ex blocked you and not his other exes without knowing the specifics of your relationship and his personality. However, here are some common reasons, framed with potential search terms:

It's important to remember that blocking someone is a personal decision, and his reasons are likely specific to your situation. It doesn't necessarily mean he feels more strongly about you than his other exes, just that he felt it was necessary in this particular instance.