Damn, Bern, it's only four chapters in - you don't get to be this much of a chad this fast.
@icarushector
is Bern a last boss of the battle variety or is he a late game capture target?
Some of the stuff said earlier implies that Bern's a battle-style final boss in many of the routes not his own (probably fighting whoever the 'route guy' was at that point), but he's the route guy for the secret route, which is only unlocked by getting everybody's affection to a certain point before various checkpoints.
So, both!
Given some of the things we've heard and seen about this game/world and how dangerous/violent and backstabby it gets, if the heroine's a reincarnator too (my suspicion), I don't think it's at all unreasonable for her to be aiming for a route where she's less likely to get a bad ending, based on what she knows of the game. What she
doesn't know is that Bern is a rather different character this time around because the MC's actions are already causing a butterfly effect. She's making the classic blunder: treating the characters she knows from the game as scripted NPCs, and ignoring one who's not supposed to be there. (We haven't been told if Bern had a fiance in the game, but I'm guessing he didn't or didn't care much about her.)
At least that's my guess so far. Time to go find the novels, I guess...