Hi Beloved
thanks for informing us about this problem!
This was a bug. We changed the message now mentioning that the cat's partner is in the cattery.
Note that if you "buy" the regular break up bottle in the cattery, and your cats were partnered less then a day, the cats will break up for free, and the KittyCatS transaction history will mention a "Break Free bottle".
Regards
KittyCatS