Taking "That Guy's In Love" as the ORIGINAL, I would handle all the "This Guy's (Girl's) In Love" as adaptations,
Because a few lyrical changes entirely reverse the meaning of the song.
"That Guy's In Love" is a characteristic Hal David epic of suspicion, anxiety and misery, whereas "This Guy's (Girl's) In Love" is nothing more than a lovesong (sung by Herb himself in devotion to his wife)
From: https://www.steynonline.com/4119/joke-on-us
THIS AND THAT GUY
Mark, I was most interested to read your piece on "This Guy's in Love with You". As a devotee of the song, you might consider investigating its secret pre-history which I've never seen set out anywhere, not even in the pages of Serene Dominic's magisterial Burt Bacharach: Song by Song. That volume does, however, list the song as being originally copyrighted in June 1967 as "That Guy's in Love with You". One word entirely reverses the meaning of the ditty, which now becomes a characteristic Hal David epic of suspicion, anxiety and misery in the style of those great "beat ballads" of the 1962-65 era:
Lyrics "That Guy's In Love" (1967)
You see that guy, that guy's in love with you.
That guy's in love, he looks at you the way I do.
When he smiles, I can tell you know each other very well.
Why don't you greet him, you know I'd like to meet him.
'Cause I've heard some talk. they say there's someone new.
That guy's in love. and what they're saying may be true.
Tell me now is it so don't let me be the last to know
My hands are shakin' just look my heart is breaking
Cause my girl's in love, so much in love
Yes you're in love, in love with that guy and I could just die
Tell me now is it so don't let me be the last to know
My hands are shakin' just look my heart is breaking
Cause my girl's in love, so much in love
Yes you're in love, in love with that guy and I could just die
And so on through a substantially different lyric which, heard in its original context, now makes sense of all the hands-shaking, heart-breaking, fear of the being the last to know-ing activities (or conditions), which at the time puzzled me in what was meant to be a happy song (I thought). Hal rather illogically retained all that when giving the song its radical make-over for Herb.
I got the lyric from the only recording I've ever come across of "That Guy's In Love With You". It was made in London in late 1967 or early 1968 by British singer Danny Williams. It came out on a Decca/Deram LP in advance, I believe, of the release of the Alpert recording in the UK and proceeded straight to the cut-out bin of history. It was produced by Dick Rowe, the poor man forever derided for having (supposedly) turned down the Beatles when they auditioned for Decca in 1962. The arrangement is by Les Reed— much taken up with Tom Jones and Engelbert Humperdinck recordings at this time— and takes the skippy-beat approach, which featured on so many subsequent versions of "This Guy..." (not wholly in keeping with what now stands revealed as a darkly neurotic oeuvre).
Dominic's invaluable list shows that "That Guy..." was re-copyrighted as "This Guy..." early in 1968.
Lyrics "This Guy's in Love" (1968)
You see this guy, this guy's in love with you
Yes I'm in love who looks at you the way I do
When you smile I can tell we know each other very well
How can I show you I'm glad I got to know you 'cause
I've heard some talk they say you think I'm fine
This guy's in love and what I'd do to make you mine
Tell me now is it so don't let me be the last to know
My hands are shakin' don't let my heart keep breaking
'cause I need your love, I want your love
Say you're in love, and you'll be my girl, if not I'll just die
Tell me now is it so don't let me be the last to know
My hands are shakin' don't let my heart keep breaking
'cause I need your love, I want your love
Say you're in love, and you'll be my girl, if not I'll just die
JoJo greets
