He'd been a puppet since the 40's. A living weapon they could put on ice until they needed it. Bucky had been the Soviets' tool against their enemies... including his own home. It was a sobering revelation. As was the fact that he'd been such a good weapon that they had asked him to train someone else. He studied her face as she kept her eyes on the ground, taking in everything she said until she finally looked at him again. There was something else there. Something she wasn't admitting to him but, all things considered, he wasn't sure if he should ask.
That... maybe that explained everything. He couldn't tell Steve any of this. It was better if he just went on believing that Bucky had had a life after the war. That he'd grown old and maybe married. Holding her gaze for a long moment he finally let his head drop, shoulder's slumping in something like defeat. He couldn't do it anymore. He couldn't pretend everything was all right or that none of this was getting to him. "I... uh..." What did he say to this? Forcing a laugh he shook his head. "Guess I don't grow old."