Same. If you do go the startup route, why not involve her? If she spends all her time on the startup, and you spend all your time on the startup, you get the best of both worlds.
Business partnerships are already volatile enough without adding romance into the mix.
Ever hear of the mom-and-pop store? Couples, even married couples, have been running businesses together for centuries. My parents owned and ran businesses together. In fact, "can I run a small business with this person" isn't a bad question to ask yourself about a potential life partner :)
My parents owned and ran two businesses together, but they never got rich. But it wasn't a bad way to live, and they definitely saw more of each other than they would have with day jobs. Though to be fair, they also had my dad's retired pay from the military, which mitigated a lot of risks and meant they'd never be truly broke.