The two have been spending as much time together as possible in between Viall's Dancing With the Stars rehearsals. Last week, the couple headed to the Bachelor Nation star's hometown of Milwaukee, Wisconsin, for a few low key dates.
While Viall and Grimaldi appear to be going strong, it's another lady Viall feels he's let down: his DWTS partner, Peta Murgatroyd.
"It cut me at my core," he told ET on Wednesday of the judges' criticism on his latest performance. "She's doing such a great job, and [the judges] kind of put the pressure on her, and it was up to me to deliver, and so, seriously, it felt like... I feel like I let her down."