Thor was thinking more immediately, but he's not going to push the not-quite Tony Stark for answers.

Even though he wants to.

"All creatures die," he says. "Even I will die someday, though I'm not sure when." Provided he found Thanos and survived that and survived using the stones. He knew now that there was still plenty to lose. He just wish he realized that before his last encounter with the Titan.

Maybe then things would have ended differently.

"I think it's something you need to accept." You in general, not the AI or the cute dog Tony, either.