As she backed up Steve got to look at her. There was comfort in that, in how familiar she was, how she stood or held herself would tell Steve what he needed to know. Natasha could comfort him simply by being there. He was glad to hear it from her, to not have to try to get his head around it with Tony later. Best to take some time to accept that even with five years that they couldn't work themselves out, that the divide was so great. You couldn't force it and Tony had chosen a life, how could Steve ever fault him?
Steve let his hands come up, stroking down either side of her head, down her cheeks and shoulders before his hands rested on her biceps and he gave a gentle squeeze. It kept the space but said let me get a look at you. She was older and it showed a little bit, but only when you really looked for it, the hair was the only real clue.
"I wouldn't have let you go anywhere without me if I didn't think it was going to fix it," Steve agreed. If they'd split up it was because they'd needed to and because both of them thought it was the best plan of attack, Steve trusted in that.