It has been suggested that I speak to him as I'd speak to a roommate/brother/friend. So when he asks, "how was your day?" Do I go into detail about my day, because that's how I'd answer a roommate, No
or do I just say, "It was fine. How was yours?" Yes and then walk into another room? Listen to what he said about his day, validate, and then don't linger. Don't ask him about his day and then immediately leave the room. Ask him, listen, and then go about your day.
And then it was suggested to be "unpredictable." So, one day, do I answer with a long-winded explanation of my day, and the next day go into the bedroom when he comes home so as not to talk to him at all? I feel like this is conflicting advice, and I don't know which one to do. No, it means vary your routine. Do you come home every day at the same time and cook dinner at the same time and watch TV at the same time and go to bed at the same time? Come home late some day, go get dinner out with friends, and don't tell him about it ahead of time. Do you never go out at night? Go out at night. Unpredictability is part of YOU focusing on YOURSELF getting a LIFE outside of your H.
Should I go out of my way to do nice things for him? No Like, I've been stacking and emptying the dishwasher, which is nice for both of us. Do you normally do this? Does he ever do it? If it's usually you, why don't you not do it one day (unpredictable) because you're not home to do it (out GAL). Do it when it works for you to do it for YOURSELF. Your H wants to fire you as his W. Would you go out of your way to do nice things for your employer if they fired you from your job? But should I, like, fold his pants when he leaves them out on the couch? No! Leave them there! That's his job. Why would you do this? Should I initiate ANY conversations with him? Only necessary things, business-like things. Let him initiate. He is the one that wants to leave you. Let him understand what it's like to not have you constantly PURSUING him.