It’s impossible to live with an addict and be at peace. It’s hell, pure HELL. Could be using if he is having mood swings. If he isn’t being honest then you will never know unless you become like I did – suspicious etc which is awful. I finally found evidence and busted him. Addicts lie lie lie so unless you bust him or drug test him you probably won’t know for sure.
He needs help tho especially with suicidal ideation. Definitely needs see his GP