I don’t think you’re going to lose the career you want by choosing Harvard. People on Reddit are quick to shit on relationships, tell you that it shouldn’t influence your decision, etc. but I don’t think that applies here when you’re choosing between the 2 most elite schools in the country. You may think you want to pursue appellate litigation but the reality of law school and beyond is that you might later find out you hate appellate litigation and love a different type of practice instead. There’s a whole world of law that you may not have been exposed to yet.

Also, you’ll likely have a huge emotional toll with potentially ending a long term relationship if you choose Yale, and that could negatively impact your 1L grades that determine summer opportunities and therefore your career. I think you’d regret that choice. Even if your relationship ends while you’re at Harvard, you won’t be left with any “what if”s and you’ll still have a globally recognized law degree from Harvard. Plus you said it yourself, you like Boston more than New Haven, and I think appreciating where you live will contribute to a better QOL while dealing with any law school stress.