Why is he acting skittish?

So... this guy and I both are attracted to each other but he doesn't want to meet outside of work because of our age difference and we kinda work together. Today I was walking around the corner just to see him down the hallway kinda jump to back away and I just pretend not to notice when I found the person I was looking for and just walked away. Why is he acting so weird if I'm not talking to him at work or texting the heck out of his phone or... ya know other crazy desperate things. I can see why to be afraid of me if I was acting crazy...
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