Why does my boyfriend laugh when I flirt with him?

I've been in a relationship the past 4 months and when ever I flirt with my boyfriend he starts to giggle. He says he thinks I'm being really cute and it makes him laugh when I'm being so straight forward. I want to understand why he giggles because as it is right now I don't want to flirt with him at all because it feels like he is laughing at me like I'm doing something wrong or silly when I'm trying to be flirty or sexy.
Why does my boyfriend laugh when I flirt with him?
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