Hi there!
Love turns off when the cats turn 121 days old because they can no longer breed. If the cat is under 121 days old, then you can turn breed back on through the cats menu, under the breed section, but note that once breed is turned back on the cat will take 7 days before it will start gaining love again.
If you have any questions about this, feel free to message me in world or contact our support through a support ticket.
Thanks
