I’ve never made a threat. Then again, I’m probably not the best candidate as the worst my husband and I have done with each other is that either: one of us fucked up royally and knows it, and the other has a stern, disappointed talk about it; or we’re grouchy and start overreacting a little, then sulk a while, then feel bad and make up.
Threats aren’t a good idea unless you really, really intend to follow through, and soon, if major shit doesn’t happen. The breaking-up threat shouldn’t be pulled out and wielded like a club any time bad-ish stuff happens.
Frankly, if you had a little time I’d suggest couples therapy for you two. However, knowing how much being a newb lawyer is comparable to being a resident physician, I know that the “don’t work so much!” comments really aren’t applicable.
My adviser in grad school, an expert in the field of study of the psychology of interpersonal relationships, said that often what attracts you to someone at the start may become reworded as the thing you hate later on. Did you find her to be assertive? Did she seem to help you find direction or get your act together? What did you like about her, and is that bothering you now?
Also, did/does she know that you have this kind of schedule for years to come? And if so, does she take that seriously or is she like the other posters here who expect that you can just ditch work whenever? Just because you love someone doesn’t mean you can handle certain lifestyles with them.
On preview, what Vihaga said, too. For some reason she’s picking the “nuclear option” of relationship ‘communication’ and you probably know - or can figure out - better than any of us whether this is a habit with her, or if it’s been triggered by something new. (Even if she’s never done it before, maybe she has issues saying anything negative about a relationship and it’s just built up to emergency levels with your new job?)