ok from a girls point of view, i dont understand y girls go back to idiots, ive never done that myself so i dont understand y she has done this, but if she does have feelings for him, her heart must have taken over instead of her head. See we get really emotional and all rational thought goes and we make bad decisions. But this other guy will more than likely hurt her again, and guess who she will go crying to. Probably you.
It depends how u feel about her if this does happen, if she gets hurt and you are there for her, she will love you for that. But to be honest i wouldnt advise taking her back, if after about 5 months she cant get this guy out of her head, she is still gonna be thinking about him.
Hope this helps at all but im not exactly the relationship queen. good luck with it all tho, things like this just teach u things and get u closer to your true love. :thumb: