Quote: I just want her to know that I'm her friend.
That kinda goes without saying, but what you really want her to know is that you are her husband who is emotionally capable of NOT hearing what's wrong and still being there for her, and capable of hearing emotionally hard things and still maintaining his own emotional balance, independent of hers. In short, you want her to know you will listen to her, validate her, and then be able to carry on without feeling burdened by her emotional baggage. The way you communicate this is simply by doing it, not by telling her. As RB said, telling her is needy, doing it without out her knowing you are "trying" is a sign of strength.