This is common knowledge among cat owners. Slow blink is the closest signal to "I love you".
> I trust you so much I choose to momentarily close my eyes in your presence. I know you won't rip me apart with your claws, although you have the capacity to do so as a predator.
> I trust you so much I choose to momentarily close my eyes in your presence. I know you won't rip me apart with your claws, although you have the capacity to do so as a predator.