I think I unintentionally exploded a situation and have become the 'bad guy'. Help?

You didn't really give any detail, at all. So it's impossible to give much advice. However, all you did was give advice to her. You were not the one who made the situation blow up, even if you may have said a few things that didn't work so well. Everyone can give us advice, it's up to us whether we take it or not. She can't blame you. Considering the guy seems like a bit of a dbag, maybe it's best that way.