Chicago Fire has had its fair share of romances, whether they be merely hookups or result in marriages, and eight have happened between coworkers at Firehouse 51. Unfortunately, given the nature of the relationship, most in-house relationships in the One Chicago TV show have failed. Dating someone you work with can be quite complicated, after all. Only a couple of the Firehouse 51 romances in Chicago Fire have been truly successful, while the rest have crashed and burned over the course of the series’ 13 seasons.

https://screenrant.com/chicago-fire-romance-firehouse-51-ranked/