"It's past the 100th day of school and just about EVERY teacher I know has come to that "ugh, it's that dreadful time of year..." state of mind that happens every single year. Personal lives, caring for students, evaluations, testing, the overwhelming amount of stuff that needs to get done. It's February and we are slowly withering away."
His behavior will never change! You know this is who he's been for all these years. Lying and cheating. Only you can stop this by stop allowing him to come over. This will continue for another 6 years and you deserve much better. Stop letting him manipulate you!
The best response to a narc is no response! If you must respond, show no emotion... This can be very difficult, but it will deprive him of what he wants most... A narcissistic payoff from your reaction/response.
In this specific case, the person that comitted suicide choose to end its life because he/she thought/believed not to be able to stand the situation anymore.... And the ones left behind choose to continue living this way as they probably believe that they knew about the situation and didn't do anything/sufficiently about it...