Why would he drop a girl’s name into the conversation that I don’t know?

Sort of dating this guy, nothing serious - only seen him 3 times. We’re meant to be meeting later today and he texted this morning to confirm a time and then he says ‘I’m going to have breakfast with Amelia (my friend - future flatmate) then I wanna clean the place a bit.’

I trust the guy and know he’s moving out soon and is moving in with a girl. And I’m sure the girl didn’t stay over since he was texting me as he was going to the station this morning. If I was meeting a friend, I would just say ‘meeting a friend’ I wouldn’t drop a name. Is he worried I don’t trust him or something? Why would he name drop a person to me?
Why would he drop a girl’s name into the conversation that I don’t know?
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