Wow, they're so trapped in their preconceived notions that it is bizarre.
Nobody needs to go through life sheltered and protected like a baby animal, and nobody needs to be a macho man who controls everything.
Seeing our protagonist, Ruki, get her heart shredded here and then forced to accept a revised relationship on her girlfriend's terms just feels awful.
Sac-chan cheated once when she got bored, and she'll do it again.