9-1-1 actor Oliver Stark explains season 8’s bombshell twist concerning Tommy and Abby and its impact on his character Buck. Stark has starred as Buck since the pilot, who is currently in a recent relationship with Ferringo Jr.’s Tommy. However, the couple were rocked by revelations concerning Tommy and Abby. In season 8, episode 6, Buck discovers that prior to Tommy coming out as a gay man, he had been in a relationship with Connie Britton’s Abby Clark. The couple were even engaged for two years, but that culminated in the pair breaking up.

https://screenrant.com/9-1-1-season-8-tommy-abby-engagement-explained-oliver-stark/