[Felix isn't a person inclined towards explanations, but there's relief to be had at just being able to finally say what he could not for the past two months.

So he tells Byleth about Edelgard's treachery. Of him refusing an invitation, and standing with the Church as the Empire moved forward with its conquest. Of him falling and disappearing for five years, and a consequent reunion during a promised day.

Past that, Felix glosses over the details. Though he makes mention of the disastrous battle at Gronder, he never mentions his greatest regret at Myrddin, instead choosing to fast-forward to how they manage to secure footholds into the Empire and defeat Edelgard, then mysterious organization behind it all. There's some hesitation when he brings up Rhea, but for the sake of completion, he does, and ends his story with how Byleth takes over her position after the war.]

We all went our separate ways after. I found that my calling is not dwelling in Fraldarius, but other battlefields that could use my blade.