event, incident / matter, affair / scandal

to doubt / to have doubts / to be doubtful / to distrust, to mistrust / to call (a matter) into question

involvement

be involved in, be engaged, enter the picture

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

(idiomatic) to doubt what one just heard; hearing something surprising

a difficult (to solve) case

love affair