How do you understand this line? "Someone is speaking but she doesn't know he's there." Who is "someone" referred to?

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Here, There and Everywhere by The Beatles

[Intro]
To lead a better life I need my love to be here

[Verse 1]
Here, making each day of the year
Changing my life with the wave of her hand
Nobody can deny that there's something there

[Verse 2]
There, running my hands through her hair
Both of us thinking how good it can be
Someone is speaking but she doesn't know he's there 👈

[Bridge]
I want her everywhere and if she's beside me
I know I need never care
But to love her is to need her everywhere

[Verse 3]
Knowing that love is to share
Each one believing that love never dies
Watching her eyes and hoping I'm always there

...