Who Walks In, When I Walk Out?

Who walks in when I walk out?
Who gives you that "hi baby"
Who's it, who, got me jealous of you.
Who walks in when I walk out?
Now don't you know youre my baby,
who's it, who, got me worrying too? 
Well, when we kiss, I kinda miss
something that used to be.
Everyday, while I'm away, I get a feeling
that you're fooling me. 

Who walks in when I walk out?
Who gives you that "hi baby"
who's it, who, got me jealous of you?