Starkiller stiffened some at the use of his real name. It wasn't something he was use to. He was still coming to terms with all that he had done for Vader. Especially betraying the rebels. He hadn't thought it would ever come to that had Vader stayed true to his plan to kill the Emperor. But he had changed, or at least he was trying to change to help the rebels. Part of that was a desire for revenge against the Empire and everything they had done to him and made him do.
He remained quiet as Leia spoke. Her words were true, at least as far as the Force was telling him. "Is this some twisted plot set up by Vader? And how are you older looking? It hasn't been that long since I saw you on Corellia through PROXY before..." He let his voice die away. There was no need to bring up his betrayal. No doubt Leia knew of it.
"...did the rebels make it out on the Rogue Shadow from that space station?" If they did, it would be a start to making up for the things he had done. Though he could probably go through his whole life of trying to make amends and never achieve redemption. Though what choice had he had? Vader had stolen him, raised him to be a weapon against the Emperor's enemies, and then betrayed.
How different would my life be if I had listened to Shaak Ti on Felucia?