The last three sections are the following:
[Bridge]
And I say
You're the one I wanna be with (yo, yo), when the sun goes down
You're the one I wanna be with (the one I wanna be with), when the sun goes down
Singing, you're the one I wanna be with, when the sun goes down
You're the one I wanna be with, when the sun goes
[Chorus]
And that's the sound, of sunshine coming down!
And that's the sound, of sunshine coming down!
[Outro]
Hey, hey, hey (when the sun goes down)
Hey hey hey (when the sun goes down) hey hey hey hey
When the sun goes down!
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So before the "I love you" that the interpreter says, I think it is "the sun goes down"