What does it mean if a guy refers to you as “we” and not “you”?

So my ex-situationship has dropped subtle hints that he has a massive crush on me. We haven’t verbally talked to each other in months but is always around me he’ll either say “wave” or stare. Well this pass Sunday “we bumped into each other” and he asked me “how are we doing?” Instead of how are you doing? He has never refer to me as “we” in public only behind closed doors
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I thought so too but you don’t say “how are we?” I say “how are you? He never refer to me as we in public
What does it mean if a guy refers to you as “we” and not “you”?
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