Oh, ok! I actually have two brands, HBH Betta Bites and another that doesn't say. The unnamed one is larger than the other so I usually feed him HBH. He will rush toward the food and gobble it up greedily, but then seconds later he will spit it up and then try eating it again over and over. I finally got him to swallow one and keep it down. But just to be safe, I have started to crush the pellets, but he only eats a little for what I put in, and I am not even sure if he keeps it down since they are so small.
But I think he is still traumatized from being in that cup. When I tried to take him out of his tank so when I fed him, he wouldn't leave a bunch of residue in there, he freaked out and just stayed at the bottom. My other fish doesn't do that and when he did, I was scared that he was sick or something, since he just started to stay still at the bottom. But as soon as I put him back, he was back to normal. But I think he is still shaken from who knows how long he has been on that shelf at Walmart, so I will try again with the feeding later on.
Thanks for your help shellieca and lilnaugrim! :)