Disclaimer: I don't own Harry Potter and all rights go to JK!
Harry doesn't really know what love is.
The Dursleys certainly don't care much for him. So much for blood runs thicker than water.
He might love Dumbledore, but sometimes Harry looks back on the old man's actions and wonders if he ever truly cared for him, or if it was all just manipulation.
Ron claims to love him (as a best friend, of course), but he's already turned his back on Harry once before, and no matter what Harry says, he's not sure if they'll ever really mend the broken bond between them.
But when Hermione insists he put a scarf on –"because it's freezing out there!" – and brings him a piece of toast in the library even though it's against the rules, Harry gets this funny warmth in his stomach.
Maybe he does know what love is, after all.