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.
Cyndi, I also have a Sushi :)