Why is he suddenly being so aloof?

Anonymous
There is this guy from work that I have a huge crush on and for a month or so and when I first met him he would tease me all the time but in a kinda joking way so I started to tease him back and we were just kinda flirting lately but for the past couple weeks he's been kinda aloof and not really talking to me. If he is talking to people I know from work and I come up he will quickly be like okay I'll see you all later and take off or if I try to talk to him he will give one word answer's and not look me if the eye. Now he also is teasing me way less why is he suddenly avoiding me.
Why is he suddenly being so aloof?
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