My 1st thought is this... I had a "Maury" moment ..... maybe she didn't know who the dad was back then...
Just a shame all around.... This is why I look upon casual sex with disdain.... look what happens to the unfortunate offspring......Fathers ripped from their lives....often they want nothing to do with the kid, then some don't even find out till 15 yrs later he has one ~ IF it is even his.
Maybe your friend was the umteenth to take a paternity test, all others ruled out ....Was it a One Night Stand? maybe it took yrs to track him down, she gave up, ran into a tip....what is the story there?
Regardless, it ain't the kids fault... a real man would want to do the right thing, take responsablity for his willing
