Hey neighbor (Orange Park here!) -
I definitely think that is a geniune gesture that he likes you. Simply tell him how much that little gesture meant to you and invite him to dinner to thank him for caring.... see where it goes from there. Good luck!
You're not crazy at all. The chocolate bar may be a sign that he is "sweet" on you. It sounds like that he'd really like to be a friend first. And just showing to show his sensitive side. If he's a nice guy, give it a shot! What's the worst thing that could happen?........you'll have a friend.