Conversation so far:
When does Raven first appear in the comics?
DC Comics Presents #26 (October 1980)
What are Raven's special powers?
As a Cambion, Raven has an array of abilities; she is firstly an empath, able to sense and alter the emotions of others.
When did Raven begin to experience emotions of others for the first time? What happened
As a result of the defeat of Trigon, Raven was free to experience emotions for the first time in her life. Raven found she was able to not only sense, but control others' emotions.
Did Raven fight Trigon alone?
The Titans were manipulated to kill Raven, thereby allowing the souls of Azarath contained inside the ring of Azar to possess her and use her to kill Trigon.
Did Raven began to control others' minds?
She learned to handle this power only after unintentionally making Nightwing believe that he loved her when she thought that she was in love with him.

Question: Did he ever learn the truth about his feeling?
Self-contained rewrite: Did Robin ever learn the truth about his feelings for Raven was due to mind control?