Cats can be fickle creatures, but there are ways to tell whether or not your cat loves you. Here are a few ways in which cats are saying, "I love you:"
Purring While this may be a sure-fire way to tell if a cat loves you, it can also mean a mixture of other things. If a cat is anxious, they may try to calm themselves down by purring. If your fur baby is purring in your presence, more than likely it means that they feel content with you and cared for, just as they were with their cat mother.
Grooming Cats are not necessarily known for being notorious lickers like dogs, but when they do lick you, consider yourself chosen by your kitty. Licking is one of the ultimate signs of affection that you can receive from a kitty.
Showing of the belly If your cat flops down on their side and exposes their belly, that is a compliment right there. Exposing their belly makes the cat vulnerable, and if he or she is exposing it to you, they trust you more than anything in the world.
When our cats say, "I love you," the main way we can say "I love you" back is to give them the best care possible.
Also, a slow blink helps as well. (photo is of my cat Patches)