Yeah, exactly. It's such a cruel answer from Tony. "I'd have been truthful with you, but only when it would hurt you the absolute most." Clearly the answer of here-and-now Tony who is deranged/SIM, and engaged in a battle to the death with Steve who hates him, and is putting forth this picture of a future where they won and things seemed wonderful and yet he still had a killing blow to strike against Steve, held in reserve.

But yeah, all he can do is hurt him more in the last few minutes/seconds, because that future was never a thing that was going to come about, even if one or both had not been killed during that immediate fight.

Thank you very much, Loran!