Hunter proposed to Alexis in Episode 3, before Nate proposed to Lauren. Before Season 1 was over, Alexis celebrated a bachelorette party with some of the girls on the show. At this point in time, she and Hunter are still together. According to the reunion, they’re in the process of planning their wedding with the help of his mother who is a professional wedding planner.
Source: https://www.distractify.com/p/ultimatum-couples-still-together-season-1