My co worker is a nice man to me, I’ve noticed some stuff about him that he does with me, but I don’t know the difference between friendly and flirty?

So we are not that close, but he complimented my nails and he said that I always looks very pretty. He is always looking at my legs (I don’t have pretty skinny legs) he nods and winks at the same time when I pass by, his voice gets softer when he says hi throughout the day. When we talk he always wants to shake my hand, high five or fist bump and he gave me his number twice so I could send him something but I noticed he gave it to me really fast and never replied (although I was not expecting him too)

My co worker is a nice man to me, I’ve noticed some stuff about him that he does with me, but I don’t know the difference between friendly and flirty?
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