friend problem. please help!! >

I have two good mutual friends, and they are both truly decent people. Today, one of my friends, let's call him Bruno, admitted to me that he likes my other friend, "Lilly". The thing is, I know for a fact that Lilly does not like Bruno. Bruno is planning to ask Lilly to homecoming next year, and I think that Lilly will say yes, because she is a super nice person. But eventually Bruno will find out that Lilly doesn't share his feelings for her...and it will turn into a big mess. I just know that someone's feelings will get hurt. To make it more complicated, we are all part of a competitive team at school...and something like this could ruin the whole dynamic of the team. So my question is, should I warn Lilly about this or just shut up and keep to myself? Because I really don't want to be involved in this, but I really don't want anyone to get hurt either.