We work together, I gave him my number, he still flirts but hasn't called. What the heck?

tpk002
So I work at a college and one of the chefs (he's 4 years older than me) caught my eye. I worked up the courage to start talking to him and we have had quite a few things in common. He always looks me in the eye when I'm talking and sometimes seems a little shy around me. Some of my coworkers gave him my number (I was too nervous to do it!) and apparently he smiled a lot and seemed really flattered to get my number. We've continued to talk when we see each other in the cafeteria and it's not even remotely awkward... however, it's been 11 days since my friends gave him my number and he hasn't called. Is he not interested? Like maybe he doesn't want to make it awkward, so he keeps talking to me and acting normal? Of course, I wouldn't want things to be awkward, but my friends think he might be too shy to call. I mean, I'm an athletic/in shape, attractive, educated female who he has things in common with, and I guess I don't see why he'd have a reason to NOT call? I gave him my number, he knows I'm interested... what could possibly be holding him back other than that he might not be interested?
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p.s. my friends saw him "checking me out" before I decided he'd be worth trying to get to know... I really think he's attracted to me, so I'm totally at a loss for what's going on!
We work together, I gave him my number, he still flirts but hasn't called. What the heck?
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