Many people said the rebels were saying that he manipulated you when you joined them, considering the complicated situation of Empire officers thinking you we're a spy for them. However, the only person who didn't doubt you was your Master - Darth Vader. It was terribly frustrating when they spoke.

Even more so, you had to save him quickly after his duel with Kenobi. You immediately went to Malachor V, where he was probably injured. He noticed you still cared after all.