Here is a Bible verse from an earlier post
John 15:12 This is my commandment, That ye love one another, as I have loved you.
Conveniently, Jesus had just finished explaining the nature of His Perfect Love, which is not the same as ordinary old human love. It contains elements we couldn't imagine for ourselves and needed to be told. One aspect of this is what to do in cases of unrequited love? Perhaps in your introduction you could find the relevant verse.
John 15:1-12