"I wanted the truth." And he got it. For better or worse he got it. Steve looks at the floor for a second, ingesting what was said and, honestly? It's better than he likely deserves.

"I promised to stay with you," he says. "I said I would and I went back on that. You have every right to be angry and to not forgive that. I...I was furious when you were gone. It was supposed to be 'Til the end of the line', and I was alone."

He looks up and takes Bucky's hands in his own, holding them.

"I am gonna promise you again, alright? Right now when I can't lie: I promise you I'm not leaving ever again. And if I get taken away I'm gonna claw my way back.

"Do you believe me?"

It doesn't matter what he sahs. No matter what Steve knows this is going to be something he proves. And he has every intention of doing so.