The 34-year-old Bush is not married and previously dated her PD co-star Jesse Lee Soffer.
On May 25, it was confirmed that Bush has left Chicago PD for good after four seasons, although she could still guest star.
Finally, in May 2010, Bush confirmed that she and Nichols have been an item for at least four years.
The actress will have be able to widen her dating pool now that the series is coming to an end after nine seasons.
A couple years later, she began dating James Lafferty.