Severide got the opportunity to be involved with an Office of Fire Investigation

(OFI) training camp in Chicago Fire season 11, and that was seemingly the beginning

of the end. Taylor Kinney’s character left Chicago for the program, and

unbeknownst to Stella, extended his leave when he was asked to join an ATF investigation. Severide never informed his wife of his actions, which led to some friction between the two. Thankfully, Severide eventually returned in Chicago Fire season 12 after Stella brought him home. However, his obsession with OFI continues, and Severide and Stella’s

Severide promised Stella that he would change and prioritize her, which is how they were able to temporarily fix their marriage in season 12. Even though they were on good terms, Severide’s revelation during the Chicago Fire season 12 finale might make the couple take a few steps back. Severide wants to start a family, much to Stella’s surprise. She didn’t have the best reaction to Severide’s proposal, but she might have just been shocked (or she’s not on the same page as her husband). So, having a baby might be an issue going into season 13, along with Severide’s continued OFI obsession.