I'm tired of beating around the bush. Your betta's fins are obviously shorter than they ought to be. I can tell the difference between a plakat and a long-finned fish who has had his fins bitten off. He is being nipped at, no matter how much he "loves" to be with the others, and he needs to be separated from them. He is not human, and he is not the one who wants to be with the jellybeans, you are the one who wants him to be. I'm sick of this "my betta is lonely" BS everyone dishes out when they try to house their fish with incompatible tankmates, and this is about as incompatible as it can possibly get.
I tried to be nice about it, but I'm not going to sit here and listen to you give me excuses.