I think bettas can definitely bond with people, they love you because you feed them and talk to them, and they know you love them because of all the food you give them. They don't bond in the same way a dog or cat would, you can't take them for a walk or a car ride, but they bond with you in the way a fish can.
All my bettas come up and do the little dance as soon as I walk into the room, looking for attention. And food. I had one older betta that would sit in my hand and just relax, it was so cute.
My boyfriend always gives me weird looks when I'm talking to my betta, Phil. He just doesn't understand And besides, my landlord wont let anyone in the apartment complex have anything but fish, not even a hamster.
I definitely believe you can bond with your Bettas,my little boys all swim to the front when they see us and all look happy & excited.I know they love their food,but I really believe they just like to say hello and see what's going on as well,plus I swear they know their names when I call them.They love to watch us just as much as we love watching them.They all have their own great little personalities.If you love your pets you will definitely bond with each other.