Feeling Guilty

This is my first nanny job and I’ve only been working for a month but I absolutely love it! The family is great and understanding, the baby is so loving and adorable, everything about my job is perfect! Unfortunately, my fiancé finally got accepted into a school.. that is six hours away. This is a very big deal for him and I’m super excited that he’s finally starting his career, but this does mean we will have to move in June and I will have to quit my job. The family knew from the beginning that I wasn’t going to be a long-term nanny, I’m only 20 years old and I made it clear in the interview that I’m moving in the next year or two and will be starting my own business. Even though they were aware, I still feel guilty leaving only after a few months. I know how hard it is to find good help and they’ve had issues with daycare in the past. I know they’ll be understanding but obviously disappointed, & I just can’t help but feel horribly guilty. I just wanted to know if anyone else has had a similar feeling/experience and can give me some advice on how to go about quitting and how much notice I should give them.