Suffering is a sign of wrong thinking. If we correct our thinking in a particular case, that particular suffering will stop. For example, if I really want to stay with a certain woman but she ends the relationship, I will suffer as long as I desire that relationship. When I accept its end, though, my suffering will stop.
(This is an example of why the Buddha said that desire causes suffering.)
The end of suffering brings a new experience: understanding. We suffer because we don’t understand, but understanding frees us from suffering—and then that suffering leaves our experience.
You know a lot about yourself if you understand what makes you suffer.