Don't date people you work with. In a perfect world, it creates weird situations with your co-workers. But most work places are not perfect, so it's a train wreck waiting to happen with two embarrassed people, more drama than anybody wants or deserves, and one, two, or more people losing their jobs.
aka Don't shit where you eat.
aka Don't buy candy where you buy groceries.
aka Don't get your honey where you get your money.