"İnsan dertli olunca hiç bitmezmiş geceler" (When a person is in sorrow, the nights never seem to end).
The lyrics describe a person who hides their pain ("ağlarken güldüğümü" — laughing while crying), suggesting that sorrow makes one a stranger even to themselves.
If you intended to link "Bedava" (Free) to this sentiment, it likely refers to:
The most direct reference is the song recorded by Bergen in her 1989 album Yıllar Affetmez .