The family you affirmatively created is a little more than just a "problem". It's a responsibility that you took on and can't just abandon because a shiny object has captured your attention. This woman at work has no interest in you and it's not her fault you and your wife decided to get serious as teenagers. When you decide to marry someone you've dated since high school you tacitly agree to forfeit your free and single young adult years. That ship has sailed. Besides, this coworker is off the market and if you can't stop creeping on her you're likely to destroy your career.