Anywho, Acer. There's always a possibility that she will go to him over you. You can hope that she'll realize that you're the better of the two, but that's not always the case. Girls are naive, and we have this stupid thing where we listen to our emotions and not our brains...even when it's blatantly obvious who we should go with.
You don't have to be "too much of a friend". Just be there if she needs ya, yanno?