Still, the sweet lie you told yourself was easier than the bitter truth others told you, wasn't it? So yes, he surrendered to the fallacies in his head, they were easier to accept and consoling from the harsh reality.
She didn't remember him now, so perhaps he could win her heart when she was still trapped in oblivion. He lied to himself, drowning in his fallacies and fantasies.
He was well aware that the moment Draco would awaken from his slumber, it would be undebatably over for him and every effort he put into making his delusions an inconceivable reality would be over.
But hoping even though there was barely a chance seemed better than accepting defeat without a fight, moreover seeing her eyes well up with tears melted his resolve to give her up.