I think you have to treat the girlfriend like any other friend that you move away from; you're going to miss anyone you're close to, it's a "breakup". But your girlfriend hasn't come looking for you?

I don't see why your wife should do anything, if you're doing it? Too, usually the person who wants it done does it. Some people don't care if the dishes get washed today or next week whereas other people do care. But if someone wants the dishes washed today, that person has to wash them; the other person isn't responsible for what you want, that's your job.

I would work on your grief over losing your girlfriend, discuss chores with your wife and what you would each like to do to keep the household running (I usually cook, my husband does the dishes; my asthma makes my husband think he should vacuum, etc.) and join a bipolar support group and see if you can make some friends to hang out with occasionally who will understand you better.