idiocy, imbecility / (dated, medicine) profound mental retardation, indicating an IQ of under 25 / an idiot, an imbecile

action; behavior

to act

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

he; boyfriend

perfect, completed

completeness / perfection

(と〜) thinking that […] (with the next clause explaining that the truth is contrary to expectations)

to seem, to appear