Yes, Kat Edison and Adena El-Amin do get back together.
In the series finale of The Bold Type, Kat and Adena reconcile. Their reunion signifies a new chapter for their relationship, as they decide to establish their own unique rules and boundaries for what their connection will entail moving forward. This development was a significant moment for fans of the couple, often referred to as "Kadena," providing a definitive resolution to their romantic storyline.