Guys, if a girl gets flustered from time to time while talking do you assume it's because she likes you?

Several men at work act as if I have shown interest in them, which I did not so it's a bit uncomfortable as I don't want them to be flirty. I think it's because my face tends to blush at the smallest thing, I don't think I come across as shy since I have no problem talking to guys or expressing myself, but that is the only explanation I can come up with since all I talk to them about is work related. Do you guys think the same if a girl sometimes blushes while talking to you?
Guys, if a girl gets flustered from time to time while talking do you assume it's because she likes you?
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