That bad ending is supposed to leave you feeling confused.
All I have to say is play through the game up to the current point first, then reconsider your conclusion again.
Hint: There's a reason why it became a news story, that was eluded to in the bad end itself.
Also important to remember is that the game itself is set in Japan.
Where it is possible to get fired over adultery, if it brings trouble to the company/workplace (e.g. a public scandal).
But why would anyone care indeed...
Now if that bad ending was a shock, I wonder what your reaction will be to the 2nd bad ending featured in the game...