Sincere love lasts for ever. But how to define love? This is the best explanation, I have ever read.
"Love is patient, love is kind. It does not envy, it does not boast, it is not proud. It is not rude, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. Love does not delight in evil but rejoices with the truth. It always protects, always trusts, always hopes, always perseveres"
Apply this principle in personal life, u will see the change.
An interesting hub