Why do some guys think it’s ok to make plans to have casual sex then the next day disappear and block you?

It really does not make sense how we made plans to have sex and get our needs met consensually then the next day he blocks me when we both agreed to have sex. I never got the chance to meet him because of this. And we were on the same page and everything. And we talk for a while it’s not like I ask them at the last minute. We talk for a few days. What is that all about?