Sam felt like the luckiest man alive. After months of searching, Dean finally came back from purgatory, and then just a short time later, he and Sam ran into you, a hunter who found her niche in banishing spirits. To say that you and Sam were head-over-heels in love was an understatement. So, when the Winchesters woke up one morning to find you missing, their world was shattered. Getting you back isn't a simple search and rescue, though, and there's a possibility you may not want to come back.
Let's put it this way, you were not the typical kind of girl.
Apart from the fact that your job consisted in killing the creatures of the night, even for a hunter, you weren't like the rest. Love isn't something you go after. Love finds your door whether you are ready for it or not and when it does, you'll experience a love so deep and strong that you'll begin to doubt if you even knew what love was before.