Law Student's Dilemma

So I’m this first-year law student with a serious thing going with my girlfriend since before college started. We both thought it was perfect, you know? Law students are busy and we’re not exactly rolling in dough, but that’s okay because we love each other and all that romantic stuff. Then she got a new job, just for the summer, at this law firm downtown. Suddenly, she’s working late nights and weekends while I’m still plugging away at reading cases from eight to five. I mean, don’t get me wrong, I understand why she’s doing it, better prospects after graduation if we can get our foot in the door somewhere. But the thing is, there was this one night last week when I was working on a paper and she calls around eleven saying she’ll be late since they’re having drinks with clients. That’s fine by me, but then at two-thirty she texts again asking if we can meet up for an hour or so because she needs to pick something up nearby. Well, you get the idea. It didn’t take a legal mind to figure out what was going on, she was seeing someone else while doing her work thing. Not that I don’t understand why anyone might think that’s okay; it is kind of a pressure cooker in that industry with all those long hours and high stakes. I confronted her about it the next day, and we had this whole heated discussion where she kept talking about ‘expanding our horizons’ and being 'adults.' I get wanting to have an open relationship, but here’s the rub: I’m not into that kind of thing. Plus, there are legal issues with agreements like that when you’re still engaged in a committed partnership. So now we’re at this weird point where she says she wants to keep seeing other people and that it isn’t a reflection on me or our relationship. Of course, I have my doubts. And here’s the kicker: even though I know better intellectually, there are parts of me, the non-lawyer parts, if you will, that still feel torn about this whole situation. I’m not sure what to do moving forward. Part of me thinks maybe she’ll change her mind in a few months when things wind down at work and she realizes it’s too complicated. Another part feels like I might be holding back on my own desires by being so traditional, even if only in name. It’s all very confusing. Anyway, this is the type of situation where having a good friend to vent to would probably help, but instead, you get me here typing away at two am because everyone else is sleeping and I can’t sleep knowing all these thoughts are floating around my head.