Aw man, rough deal. I have had my new dog for six months now,I still call her Ollie every now and then,Ollie died six and a bit years ago. Woogie, my new dog is steadily taking up my time,no doubt she'll be missed the way Ollie was.A real friend helps a friend out and if your dog had a tumour you did the right thing. Hard,but right.
As for the two legged transgressor,his loss. Keep yer chin up,you'll find someone better.