Not a movie, but I have been obsessed with The Haunting of Hill House for a month or so. If you're looking for something with "real" depictions of suicide (i.e. no ghosts to influence the suicidal people) then ignore this, but if you look at the ghosts as an allegory for mental illness and trauma, then it's a very realistic and fair view of what suicide is for the people it comforts and the people it hurts.