DS 9, a veteran of 4
DCL cruises, watched Titanic with me. He had seen it before. Doesn't get upset. We have discussed how many safety rules exist specifically because of what happened to the Titanic (like, uh, having enough lifeboats for everyone on board...that one still impresses me as winning the ******* award for 1912), and how radar and sonar didnt exist so they did not have the computerized map of how deep the water is at all points, and no ice in the bahamas or caribbean, and not only enough lifeboats but we have looked at them, how they are covered and motorized, ship's design, etc.
If your DH won't go, he doesn't need Titanic as an excuse. But some folks are bound and determined to live in a way that makes surprises impossible. As your deadline for full refund approaches, you need to consider blowing the lid off the surprise--and the loss of fun & whimsy is the price of DH's concern, if he is not just BS'ing you