There were a lot of things that Pepper didn't understand, like how he'd thought about the deaths that were on his conscience. Happy's for instance. He'd been the one to shut down the life support, a system he should have never been on if he hadn't been beaten to a pulp in lieu of Tony. Then there was the first baby lost and now a second one, not to mention a man he admired and looked up to, Captain America, was dead and though he hadn't shot him, he might as well have pulled the trigger since he was the reason Steve had been arrested. That damn war had stripped Tony of everyone who he loved and cared about. Even Jarvis wasn't spared. Eventually, every man had a breaking point. Tony Stark had found his.
He didn't want her to know all of these things because he was afraid it would make her look at him in disgust, and she was all he had left. Without her, he was nothing.
"You are fixing it, little by little. You're all I have, Pepper," and he kissed the back of her hand in his. "I think you'll have no problem getting me going again. You were always so good at that even when we weren't having sex all those years ago. I told you I'd make sure you were very satisfied tonight. A month was like an eternity for us."