Cute guy keeps teasing me?

This guy I barely know at work is so weird. I ve talked to him once, and it wasn t even talking, it was just him helping me. Anyways, recently every time he sees me he starts to tease me over little things. For example, I was handing my coworker some papers but then I realized I had given her the wrong pile, so I yelled “I am so sorry!”. The guy was standing near by and he then came up and said “Wow Jenna! Screwing up everything again huh?!” He teases me like this a lot, or just tries to make me laugh I guess.

Ive noticed that he is always staring at me. I usually look away shyly but sometimes I ll smile and he will smile back. He s kind of cute, so this is why I am so curious. I d like to go talk to him but we are usually so busy and I don t get much time to.

What do you all think? He obviously doesn t like me because he knows nothing about me, so why is he like this?