DC Trinity but they do, in fact, outlive Bruce
They always knew, Clark and Diana, that there was no universe where they die before Bruce does.
A godlike being from another planet and a divinely-crafted warrior could survive death's claws digging into their skin; a human's flesh, however fortified, can only truly withstand so much. For all his brilliance, Bruce can never outsmart the fallibility of his own design.
They just hadn't thought it would happen so soon.
Death wasn't permanent, it shouldn't be. But they had the body, had heard the bones crunch and the blood come out in heaves, collected the torn parts of armor that failed their purpose.
Bruce was dead.
Could you imagine what that turns out to be like?
Clark, who looks so much like Bruce, can't even look at a window too long because he might think, he might hope, that the reflection he's looking at isn't actually his own. The kids see him and actually freeze up, Damian tears up and has to leave the room. Clark elects to stand at the back of the chapel during the funeral service, but he towers so tall that he haunts Bruce's family anyways.
Even Diana can't look at Clark too long. The silhouette is there, but not the signature furrow of the brow nor the smugness of expression. She stays in denial the longest, maybe because out of everyone, she has all the time to spare. She makes jokes, trying her best to cope, trying to lie to herself — but jokes are always made with half truths. It isn't until she sees Jason again, the boy being unmasked and looking like the friend she had lost, the picture of Bruce's age when they had first met, that Diana bursts into tears for the first time.
