The ones who get jealous when Tadano was fed by Yukapoyo isn't only Komi and Manbagi, but surprisingly (or unsurprisingly) Katai-kun too (see page 4, first panel)
#KataiBestGirl (not that i ship Yaoi or anything, just 4 the jokes)
Also, Tsunde Reika... if you didn't feed him because you thought you feel pitiful... what could it be?! (A new girl to add to the Harem Mr. Chadano?)