Why is there this awkward tension between me and my boss?

Anonymous
It's hard to explain but sometimes I can't read him. I feel like he doesn't like me sometimes and sometimes I feel like he might be attracted to me. He will cpme up to me and talk to me when we are alone and then as someone else shows up he gets all awkward and leaves like he had been doing something wrong when we were just talking. Or he will be super awkward when we are alone too. Sometimes forgets his words or stumbles over them. He is fine with everyone else and I see him laughing ajd easily making conversation with them but I feel this tension in the air when he comes near me, especially when we are alone. He compliments my work so I try to tell myself it's not that he doesn't like me. But I don't know why he acts so "off" around me.
Why is there this awkward tension between me and my boss?
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