I know Sandy and Spongebob are in love for some funny memes, images, and that Sponge mentioned something about he've married with 'er.Who believes it (except me)?
But this topic is similar to one about Toad and Toadette from Mario series. They might be a couple, or they might be friends. Just like Sponge and Sandy.
No. They don't love each other, they're just FRIENDS. And I tell you from my most sincere opinion.
We have a whole page about this: SpongeBob-Sandy relationship
I (sadly) agree, didn't SB accidentally reveal he had a crush on Sandy in the SpongeBob SquarePants survival guide?
What do you think?