My betta fish keeps spitting his food out even when its hungry?

i got him 2 weeks ago, so i decided to feed him the next day with 2betta pellet food but he just kep sptting them back out and hes been doing that ever since!

even if i dont feed him for a day but i feed him the next he just spits it out... why is that?

and he looks healthy to me
 
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