Supermarket crush confusion?

Call me stupid but even though I am an older women I have not had a relationship in 11 years and have not even dated for about the last 5 due to single-handedly raising my sons who are now grown. I very rarely get a crush but there's this guy who works in my local supermarket who I think is beautiful. Trouble is I have no idea what he's thinking. He sometimes makes strong intense eye lock in with me, he will then smile, then other times he just ignores me. I originally caught him gazing at me the first time I saw him, now he just ignores me. He seems to need to be around work colleagues to feel more comfortable around me. I don't understand as we are hardly youngsters why he behaves this way. I don't know what to do about him. It's hard because he is at work and I don't want to make him feel uncomfortable or seem desperate just because I am older. He sometimes looks almost scared and confused. Am I wasting my time? Please help me out guys :)
Supermarket crush confusion?
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