"No, I don't know. You can't come in because I smell good? Is it-- is your sense of smell getting better? Super sensitive or something?"

He doesn't get that Steve is attracted to him, because he never considered that would be the case. He still remembers when Steve first came out to him, and Bucky had felt a soaring hope that maybe this might mean something for the dumb crush he'd had for years, but his friend had never given the faintest indication that he'd ever want to make a move.

So he had never said anything, and he definitely didn't put two and two together on this.

"Do you feel dizzy?"

He's so out of his depth it's not even funny.