as a fosterer, I make my self very clear, that I am just a fosterer. Thats mean, what ever it is, they will be gone to their new owner.
so for me, I have to accept my role, and keep in mind that there are lots more cats out there need help.
and actually I did not put hope to the new owner, i put my believe that they will give them good care and love... so that makes me feel easy to let then go and not feeling too sad