He squeezed her arm, and for just a moment, Natasha ached. Not physically, but a longing, a low thrum of sadness. For five long, terrible years - for her, at least - they'd had each other's backs in a totally different way than they'd had at SHIELD, or in the Avengers, or even when they'd been on the run. They'd kept each other together. They'd grieved together. Fought though it together. Become more resilient together. They'd had to.
But this Steve... this one hadn't gotten that time. They were different now, with those five years between them. She would have to stop expecting things to be the way they had been if it wasn't just going to be an endless cycle of arguments. They wouldn't be able to be friends if it was just a competition of who owed what to whom.
And she didn't want them to not be friends. "It'll be all right, Steve," she said, after a second. "Let's just let it go. Yeah?"