Guys when he approaches to talk to me always forgets what he want to say to me?

So there’s this guy whenever he approaches to talk he always stays silent for the first 10 seconds as if he forgot what he’s trying to say and it happens a lot when he’s approaching me he look confident but as soon as he tries to speak to me he forgets what to say and stays silent for a few seconds why do you think he’s acting like that?
Guys when he approaches to talk to me always forgets what he want to say to me?
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