The problem with this situation, this particular argument (if anyone could even call it that) was that there wasn't really a clear way to fix it, not really. Tony had been wronged and would probably feel like that forever, on some level. And Steve had done what he'd had to, and would do it again undoubtedly. Neither were in a place where apologizing was even an option to be put out on the table. Even if it was, it wouldn't mean anything, not really.
The only real way to get over this was to acknowledge it and then see if Tony had it in himself to forgive.
He thought he might. He'd been working on it. That's why they had this house and a stupid porch that Tony was going to clear off and use as an actual porch. It was why sometimes Steve went out before he got up and returned with coffee.
When Steve pressed his face against the back of his neck, all of the tension and fight seeped out of him until he was loose in Steve's arm, back pressed more firmly to his front. It was unfair of him to say that Steve hadn't been trying, because he had. Tony was simply too stubborn to see it.
"I was going to," he murmured. "I wanted to." He let out a humorless huff of a laugh. "Got kind of side tracked."