Guys, can squinting be taken as a sign of flirtation?

Whenever he sees me and acknowledges me, he squints his eyes and smiles. I know it's not because it's bright and he doesn't have problems with his eyes. Does he not like me or something? Because we flirt a lot, is this also a sign of flirtation?
Guys, can squinting be taken as a sign of flirtation?
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