Do you know the difference?

Girl and guy are texting. If a guy writes ‘héhé’ after a sentence instead of ‘haha’. What does that mean? Where lies the difference? Because he uses both forms and it’s doesn’t look random. He uses “haha” more and “héhé” sometimes. Okay I know this sounds stupid, but there is really a difference. I just don’t know what kind of *^^*
Do you know the difference?
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