Help! why is behaving like this towards me?

he was so rude to me he told me to help him then tells me to not come on side and saying “ i dont need u” he didn’t smile or laugh. Turns out it was “banta” 

Then i told him off and fast forward 1.5 week later on Friday was my last shift so when i walked to my locker i saw him go outside on the time i finish which is 1:30am which i thiught odd.

then i got my mate to ask him to ask his snap and he got her phone typing lets get to know each other bs and says he will add me later but then he didn't. takw my snap but viewed my profile and my mate said why aren't u adding her he goes im a headache….

Why would he follow me around and come close and talk to his cousin and his cousin went told him she's leaving today after he asked whens my last day etc i think he's annoyed at me over me telling him off to supervisor he's a realy chill one i couldve done worse but i didn't so I don't know why he behaves like that , and he noticed my perfume lol but why message me bs like that

Help! why is behaving like this towards me?
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