What does it mean if I'm mad at my fwb?

its called a fwb for a reason.. so when u get upset for him being distant you're going into girlfriend territory.. which is obviously something he's not ok with or you'd be in a real relationship.. chances are he doesnt want a relationship and if u keep acting like angry gf ur gonna lose the benefits so u should decide what u want and get out if u realize its not what he wants