Scary. I kind of have to side with A here. If you're not married, you shouldn't have to put up with a shitty job to be with someone. That's just resentment waiting to happen that will blow up your cherished relationship anyway.
Good relationships have to survive times where things aren't going so well for one if not both. But making that sacrifice before you've even had much of a time where you're both operating from strong lives seems a little premature, IMO.