Yeah you've set yourself a bad precedent there. Any less than the whole thing and you'll feel deprived!
I've noticed I'm getting greedier with my sugar free jelly too. Whereas one sachet used to do me three days, I now make two sachets at a time in a larger pot yet only seem to get four days out of it... and tend to have a few spoonfuls each time I fill up my daily pot!
Little things slipping in!
Anyway milady - no one in the "real world" would eat an entire cake on his/her own <and admit to it> so have JUST a slice like properly civilised individuals would!