First Girl I Loved [D] John Hartford

Capo 3 if you want it to be in tune with the record.

To me this song has some ambiguities that make it interesting (or hard to play, depending on your point of view), 
sometimes due to the bass or mandolin hitting a note that the guitar may not be covering.
But this is my one-evening's take of it, for a single guitar sometimes hitting a note that may be done on the record with another instrument (like the D6).
I think the A sometimes sound better with a string open, such as I've shown as A6. Especially where he does a little lingering strum on the chord in question.
A bit of back and forth between the A6 and Em7 works for me.
This is my opinion and laziness, preferring to find something that sounds similar rather than working on it all night!
I admit my "run2" is a bit klugey.
Hope you like it.
Oh, I'm not buying the "to a boil" suggestion. Sounds like "tinfoil" to me and makes more sense even.

INTRO: D Am7 x4

VERSE
 
 D      C*       G*        D*        E7*    
---2--|----0-|-----0---|-----0--|-----0--
---3--|----3-|-----3---|-----3--|-----3--
---2--|----0-|-----0---|-----2--|-----1--
0-----|--X---|---------|--0-----|-----0--
------|--3---|--2------|--------|-----2--
------|------|-----3?--|--------|---0----
                                       
Run1:
e-----------------------------
B-----------------------------
G-----------------------------
D---------------------------0-
A---------------0--2--3--4----
E---0--2--3--4----------------

Run2:
e--x---------------
B--x---------------
G--x---------------
D--2---2----0---2--
A--2---4----0---2--
E--0--------0------


Chords:

Am7 002010
Em* 079987  or   022400
D6  x57777  or   x00202
Bm  x24432
A6  x02200


I was in [D]Love with you oh be[C*]fore I knew
It meant [G*]more than just wantin' to be with you
I used to [D*]look for o--,ther [E7*]girls that looked like [Run1]you 
But the [D]laws of nature said [C*]forget it son
[G*]Least that's what somebody told me
I [D*]worried about it a [E7*]little bit, but that's [Run1]all.

 (INTRO x2 WITH C bass over guitar Am7)

I dreamt that you were Joan of Arc and 
I was Don Quixote
And everywhere we went the world was tinfoil
But I gave up dreamin' and became a priest
And put it right out of my system
I worried about it a little bit, but that's all

  Chorus:
 Now you [Bm]used to play the [A]guitar
 We [Run2]worked in a country [Em]band
 I [Bm]hung out down on the [A]river bank on [Em7]Sundays
 Your [Em*]brother was my [D6]closest friend
 He [C]drove a pickup [Bm]truck
 He [G*]used to bring me [D*]home sometimes from [Em7]high[A6]school[Em7][A6]

Now I was fifteen oh the very first time
Love broke completely inside me
We were young and we were learning about it together
And we had enough of what we thought we'd need of those
Well known secret fables
We worried about it a little bit, but that's all

I regret that life won't be long enough
To make love to all the women that I'd like to
Or least of all to live with the ones I've loved
But I've never regretted a love affair
Except one but that's all over
I worried about it a little bit, but that's all

Now I heard you lived way up north
Your kids are fighting plenty
And I haven't seen you brother since way last Easter
And if every other girl in the whole wide world
Was just a little bit more like you
I'd worry about it a little bit, but that's all

Chorus, instrumental verse