What does he want from me?

animelodies
I'm not close with one of my male coworker and we're not texting everyday. Yet, I realise he always texted me at midnight and act nothing the next day at the office. Talks a lot of random things when others not around and being cheeky when we're alone. Tease me until I'm annoyed and smile (I'm a girl with short height and he's about 5 ½ ft). When I tried to avoid and no any interaction with him, he always have the idea to make me speak with him. He also always pick a fight with me. I don't understand why.
What does he want from me?
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