After Vegeta had made his choice, he still kept it quiet. Especially from Bulma. He knows what kind of reaction she would give him; to fight him over it, to try and find a way around it. And he didn’t want her to know. She was heading back to a time where she would be safe, where she would have he and Goku fighting to keep their planet safe, and back to their family she had been away from for so long. He wants her to focus on that, not what gamble he has to take with his own path.

Instead he tries to show no signs of anything being off, just getting ready to go, which mostly was trying to figure out what to do with all the junk she had accumulated over their time here, snarking at her for having collected so much and how much a mess it all was. Yet it’s as they come close to their final platform, their final stop, he will have taken her aside from others, to try and steal some time alone with her before they saw everyone off.