Say you have been planning to travel to Asha, Austrailia and Europe for 12 months and due to leave in January, the tickets are bought and the itinary routed. You met someone in June and are really getting into them, you are madly in love, or if you don't so love - scary amount of NT's seem not.... are increadibly attracted to them, enjoy interacting with them etc etc... so on an emotional level they are great but you are going to be away for 12 months
Dump. I'm not going to allow someone to get in the way of my plans, especially since I place personal growth higher than romantic relationships. Plus, I'll be back after 12 months. And if they are seeing someone else when I come back, then it wasn't meant to be in the first place.
An alternative is that you really love a person and have been seeing them for over a year, they have to move for work reasons, their ideal job has been offered to them and they are moving to a small town in the middle of nowhere and it would have serious impact on your life if you were to move - you don't want to relocate but still love them....
Dump. I don't want to sacrifice my dreams and move for someone else. Unless I hate where I am living, then I would come. Otherwise...