So, the first time, you fled Void during a battle between his people and yours? *She emphasizes that he belongs to the latter, not the former*

As for the second: you tried. By then, you well believed that Void could kill you both, and you were defending Cyclonus's life, as much as your own. He would be safe, at the cost of your relationship to him and the others. It was actually rather noble of you, given the impossible circumstances you had. It was a hard choice to make.