Why do people message you something that they want to make you do and then Block you after you tell them no or let's get to know each other first?

They might be shy, or insecure, or just want to make you do something right away, and people like that are control freaks, which ain't good in my experience. Probably best they blocked you, there are plenty of fellas who would take their time to get to know you, life ain't a wham bam thank you ma'm world in reality. Good luck, but I think you're a lucky girl already 💙