Steve thinks about it for a minute. There's a million things really, just piled on top of each other and overwhelming him completely but it all seems to lead back to one. "Alone. I...I don't like being alone." he whispers, swallowing hard. "Everyone I love goes away, they get hurt and then they're gone and I'm alone. And...it scares me." There were other things of course, knowing he'd killed men who were fighting for their country and happened to be on the wrong side of the war, seeing his own men hurt and killed because he made a mistake or didn't get there fast enough, knowing that there were worlds and universes and hundreds or thousands of races he'd never known about and couldn't understand. But in the end he would be able to deal with those things, it was the loss, the worry that one day everyone he knew would be gone again, that always made his chest tighten and his fear peak. "I don't like being alone." he whispered again, tucking his face in against the side of Peggy's neck, holding her a little bit tighter again.