everything

understanding, comprehension / appreciation

even if one says

(slang) of unclear meaning/purpose

(in negative sentences) at all / completely / truly

expresses exasperation: honestly

understand, comprehend / appreciate

(adverbial particle, dismissive, derogatory) emphasizes disgust, contempt, or otherwise negative feelings of the speaker: whatever

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend