True love is one that is free of any personal interests.

Concerning any love that is dependent on another matter, when the matter ceases to exist, the love ceases. But a love that is not dependent on another matter never ceases. Which is the love that is dependent on another matter? This is the love of Amnon for Tamar. Which is the love that is not dependent on another matter? This is the love between David and Jonathan. (Mishna Avot 5:16)