Blackballed for leaving after only a year?

I am working (and excelling, according to my managers) as a first-year RN at a great hospital that has really helped to foster my professional development. I've taken classes, gotten certified, held leadership roles. Everything. It's been awesome. The only issue is that this job has put me in a long distance relationship with my fiancee. Now I'm a little older than most first year nurses because nursing is my second career, and my fiancee and I feel the urge to settle down and start a family together. I've been looking at jobs near my fiancee since she's not in an industry that allows for changes in location.

I've been given the opportunity to interview at my top choice hospital around my fiancee, for whom I could envision working for a long time. But I have a good working relationship with my management, and I feel like they are really grooming me to be a leader on the unit. And if I told them I want to leave them after only a year, they might be devastated. And I fear that devastation would make them blackball me or something. This is a very influential hospital and healthcare system. But this year of long distance relationship has been gut-wrenching for my fiancee and I, we hate the distance; and we've struggled to cope with it for this long, I cant imagine going significantly longer.

So, is being blackballed a realistic fear? This company has a policy (that I've found is actually pretty common) that states employees have to work at their post for 24 months before applying for internal transfers, so coworkers always talk about "just getting my 24 and moving on". And there's going to be a bunch of senior nurses leaving for grad school in the upcoming months as well. Would I be considered just another RN who's leaving, or would I be seen as a "defector"? I just want to know if other people have had experience in similar situations of resigning for family reasons and how employers received the news. Thanks!