This is set right after the events of Marvel's The Avengers and before Iron Man 3. This is before Steve finds out about Bucky being alive. This is my first story, so sorry if it's short and bad!
Steve still woke sometimes, in the middle of the night, when no one, except for JARVIS, was around to hear his heart beat out of his chest. In the beginning, Natasha had been there to get him some coffee and sit with him through the night, talking about one trivial thing or another. Steve knew which questions he should answer truthfully and which he should ignore, ready to ask her about something in her life he really didn't care about, no matter how much everyone thought he did.
Now Natasha was convinced he was fine, that he didn't need help, that he was perfectly spry after seventy years in the ice. Steve liked to think that too.
Nobody else knew, or maybe they didn't care, maybe they thought that their wayward brother or suit upgrades were more important than their captain's health. Steve didn't feel much like a captain.
Now he stood, then he fell, feeling the ice pierce through his heart as he was sure it would seventy years ago.
He would look out onto the city, see the lights, remember his old friends: Howard, the playboy, who always seemed to have a grin on his face and a woman around his waist; Bucky, the best friend, who he had been through everything with. Bucky always seemed to be there, always showing up to help him get out of a fight with some commies or defend him from Nazis. But that had been seventy years ago. They were dead now.
When he started on this train of thought, he tried to avoid thinking about Peggy: her bright lips, fiery temper, kind soul. He had once wondered if he would have been able to get by without her, but after he lost her, he found out he couldn't. He could barely tell JARVIS to lock his door before he broke down, tears staining the pages of his sketchbook and making the graphite smear.
He still wasn't over what had happened seventy years ago. He hadn't recovered, and he thought he never might.
Between the battles and media and new technology everyone teased him for being slow with, he was still just that skinny kid from Brooklyn.
And he couldn't forget the date he had promised the love of his life he would show up for seventy years ago.