why did he block me?

this guy and i work in the same mall. i post things on my instagram story to advertise the store i work at. he found me on instagram and started talking to me. he told me i looked good etc... he adds me on snap chat and starts sending me selfies of himself and asks me for some and i told him no. i said dont make this akwared because i pass by you guys everyday and i will beat ur ***. when he kept sending me selfies, i told him to stop and then he responds "what" and i all i said was lol. he continued to look at my stories and then decided to delete me off, he still kept me on instagram and was viewing my stories then but then decided to block me. he then saw me at the mall and looked at me up and down and gave me a look. why did he block me in the first place? nothing even happend?