He’d liked Jack when they’d first met, disapproved of his ways but still, he’d been a decent enough sort, if a bit over-friendly. A rough diamond perhaps, someone the Doctor could polish into shape given enough time. He’d been a good travelling companion, entertaining with his outrageous stories, and he’d certainly been brave, willing to throw himself into danger to help others, but now…
The Doctor can scarcely bear to be near him, never mind look at him. Jack is wrong, a fixed point, something that shouldn’t exist.
He wants Jack gone, to never have to look upon him again.