We watch "The Family of Blood" (Series 3, Episode 9) where not-quite-The-Doctor and Not Rose raise a boarding school child army to defend the Doctor against an alien invasion. Whist there, Not Rose gets into a pub fight, Not Rose professes her love for the Doctor and Not Rose is then mortified that the Doctor remembers said profession after losing his humanity. And the Doctor causes a whole bunch of deaths. And breaks Joan's heart. But at least he showed the aliens mercy. Wait! What? Oh crap...