You didn't break her trust. There is no way to trust that a person won't love you. Thoughts are not actions. You acted exactly as she expected, as a friend would. You can love a friend extremely dearly without being in love with them. Love doesn't require romance. Be steadfast in your friendship. If you want to pursue and decide to, drop some hints and see if she picks them up. If she doesn't, accept it's not a romantic sort of love. That doesnt make it a love any less important or worthy.