Friend got cheated on - how can I help her?

My friend found out a few weeks ago that a guy that she was dating – and very emotionally invested in – had cheated on her. She is still very devastated. Is there anything that I can tell her, beside the usual “other fish in the sea” cliches, that will open her eyes and make her feel better? I already have let her know that I’m there for her, but it’s been a few weeks and I want to lend her some perspective on the situation that could maybe give her (and anyone else here who is a victim of cheating) a little enlightenment. Thanks.