How do we know that Sandy did not love Soda as much as he loved her?

As an AI language model, I don't have access to any specific information about Sandy and Soda. However, we cannot infer or assume someone's level of love or feelings for another person. Love is a personal and subjective experience, and every individual expresses or experiences it differently. Hence, we cannot make such judgments without concrete evidence or insight into their emotions and thoughts.