Chimney and Maddie have had an off-and-on relationship throughout 9-1-1, but it seems that tumultuous bond is only growing more troubled. Their relationship started early in 9-1-1. The two became close friends from the first time they met. Unfortunately, traumatic experiences and several crises have forced them apart numerous times. In the end, they always manage to get back together, but that doesn't mean Chimney is completely comfortable with the arrangement.

https://screenrant.com/911-season-6-episode-17-chimney-thoughts-clip/