Grenade : This is common issue in US which you already mentioned and i have seen few cases as such too once the girl dumped the boy just for sake of some dumbass with PR forgetting the moments & relationship,memories she shared with boy the girl doesn't deserve the another chance but give yourself some time i know if you love someone it's hard to let them go just like that but before making any moves let the girl realize her mistakes and see how she comes out don't commit anything in rush .

Just stick as good friend without showing her anykind of emotions to her for few months if boy thinks she is good enough to be trusted they can start fresh relationship putting the past behind . I know several people who ended up making wrong decisions just give it a thought i am sure boys so such mistakes too specially these days where Int. students are more worried about their future rather then their studies .