The pair had got to know each other from working together on River City.
The woman said she did not want anything sexual to happen, but believed Robertson, of Carbeth, Stirlingshire, did.
The relationship became intimate, but the woman recalled later insisting to Robertson she wanted their relationship to go back to being more platonic.
Asked by prosecutor John Keenan KC how Robertson reacted, she said he “agreed”.
But the witness added: “It was a long back and forth. Iain was convinced I was in denial about having feelings for him and in denial about what I wanted.
“I do not think he believed me.”
The woman stated she felt her “boundaries were being ignored”.
During closing speeches, Keenan said the jury had heard “strong and overwhelming” accounts from the women about their experiences with the actor.
He said there was a “common theme” of Robertson treating the women in a “controlling, humiliating and demeaning” way.
Keenan said Robertson’s own evidence at the trial had been “wholly incredible and unreliable”.
Robertson told jurors he was “no angel”, but denied all the charges against him.