She may have to accept not being his sole top priority (she was willing to accept that his child came first, actually, so she is capable of that).
I was with you until this. I think there’s a world a difference between accepting that your husband is going to put their child first (and I’d argue that most married couples would agree that’s perfectly in line with reality) and making power (the drug on this show) a top priority. I don’t know that Belle should have to compromise that/accept that. Even if the power doesn’t make Rumple hurt people and is being used for something more altruistic, it’s still power (read: drug) over her. And that’s where I’m struggling to find this middle ground because I don’t know how a human being accepts being a tied number one in the heart of their significant other when the thing you’re tied with is a drug.