Patrick Flueger and Marina Squerciati’s characters on Chicago P.D. were engaged for a short time. They are no longer a thing on the show but are still very good friends in real. The closeness they display in public have led many of their fans to speculate that they are dating.
Patrick Flueger has even been rumored to be the father of Marina Squerciati’s baby daughter, who was born in early May of 2017.