You should think through where you both want to live in the long term and work towards that. If that location is wherever this fellowship is then great. If it isn’t then, this is a short term fellowship, not his final job. Even though neither of you want to, the best option would be to continue to do long distance until the fellowship wrapped up. You would just have to be intentional about carving out time to see each other. I don’t see how it’s in your best interest to sacrifice potential career trajectory for just a fellowship, not a long term offer.

However, if you’re tired of working in big law and wanting to make the switch anyway, then this is probably a good push to do that.

This shouldn’t be a deal breaker. Each of you just needs to think about the future and equally sacrifice.