You'll never be able to go completely "dark" since you want to be active in your SS life. So go "dark" in terms of living your L without your H in your mind.
Spend quality time with your SS, be nice to your H when he's around (looking as attractive as possible), then go out with your friends or take up some hobby that you've always wanted to get into.
Let him think that you've moved on.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.
