What does it mean when a guy says “Hey” with a giggle and smiles at you?

Anonymous
What does it mean when a guy says “Hey” with a giggle and smiles at you? He always seems shy around me and there’s been a time his words got jumbled when he was talking to me because he was nervous. During this time he was also smiling and kind of laughing. Also, when I walked into the room, he kinda laughed. Does this mean anything? When we do talk it’s always flirtatious eyes, smiling and giggling. Almost like we make each other shy.
What does it mean when a guy says “Hey” with a giggle and smiles at you?
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