Steve didn't want to move, he didn't want Tony to move. Not ever. If they could just stay, maybe the future would never come and they'd never have to worry about any of this. They could just be together and that was all Steve wanted. But they had to move, the ground was just getting harder and Tony wasn't comfortable anymore and as much as Steve wanted to hold onto him he'd have to trust that if he let him go now he'd get him back later.
He helped Tony up before he got to his feet as well, brushing off the residual dust on his trousers. "So Pepper, you love her, she loves you but?" Steve needed to know a little bit more, maybe for peace of mind or maybe because he'd go crazy if he didn't.