[Steve pauses in his work, his jaw set tight as he hears that. It hurts, that ultimatum, and he's not sure Bucky knows just how impossible it is for him to just leave it like that. Finally he starts up at his task again and speaks softly, keeping his voice controlled and level.]

Why are those the only options? Either you stay and I keep you a complete secret or you leave and I never get to see you again?

[It's actually making him mad, as he thinks about it, but he keeps that tightly controlled. But seriously, why the hell are those the only options? Why is he being wedged into such a corner? He wants Bucky to be able to make his own choices, but doesn't he get some kind of say in this?]