master of none-
just a thought b/c i do have an older dtr...
and keeping in mind i don't know your family umm dynamics? dating rules, what's allowed etc
i am wondering, since i do not know your DD age, but knowing that if she is old enough to date- i am wondering if perhaps it is more the physical side of a relationship the boy wanted and your DD was unable to reciprocate? because she is younger...
the boy saying she wasn't "worldly enough" well--- one boy said that about my DD when she wasn't ready.
did i just make any sense???

my DD had issues like this- she was the guys match on many levels but being just enough younger that she wasn't ready for what he had in mind...
hopefully you and your DD have a great open relationship where you can both freely speak to one another and that even if this was an issue, your DD would be able to discuss with you...
(and tell the guy to take a flyin leap! she's too good for him!
;)~