If Steve was going to continue to fret, he'd do it later and in private. It did suck, but there was a difference between moping and continuing to think about the problem. One was not productive, while the other might turn up solutions.
He'd think about it.
But, for now, there was a costume to settle and questions to ask. Steve folded the suit onto his shield. As he was doing that, the band on Tony's finger caught his eye. Huh. "I didn't know you were married." Truth be told, Steve wasn't even certain if he'd heard that Tony was seeing someone. 'The Earth needs saving' had sort of trumped everything not directly related to the mission.