I know I have to leave him. I don't know how to do it. Or how to leave our relationship. is it fair to tell him i'm leaving, but if he gets sober i'll come back? Is it harmful to him to tell him why i'm leaving? that if i don't it would ruin my life. or is it better to just leave, delete his phone number and burn our photos? I don't expect any way to be easy, but i don't want it to be harder than it has to be...