system
Given the following post, respond as if you're commenting on Reddit:
human
[Dragon Ball] What does Bulma see in Vegeta?

When Vegeta first showed up, he was a mass-murdering space mercenary that treated her and everyone else like shit. He never apologized for it, and over the years he seems to have settled into one single mood of "grumpy asshole" with varying degrees. I'm not even sure the guy has ever legitimately smiled, and it's pretty much impossible to imagine him ever saying something like "I love you". So why does Bulma stick with him?
gpt
While not explicitly shown, his arc in the Buu saga heavily implies that he sacrifices training time to help Bulma take care of the kids while she runs Capsule Corp. This was further shown in the Universe Survival Saga, where he would rather be with his pregnant wife and new kid than train. When Bulla is born, he is shown to be skilled at holding babies, changing diapers, and general childcare. 

In summation: he loves his wife, supports her career, and helps with the kids. When the two hotheads clash, he usually defers to what Bulma wants, even when it's something as important as naming their daughter. Even though he's not very romantic, he has a lot of traits that make him desirable to women; his devotion and commitment to his family is unmatched and a crucial part of his character development. He is an infinitely more responsible husband and father than Goku.