From experience, I feel that someone must have some type of power over you if they can make you cry, angry, or instantly fill you with happiness. No matter the distance or the time that sets you two apart, they may still have that ability. Love almost make this power infinite. No matter who comes along or what happens, sometimes, there will be that one person who has acquired enough of your energy, of your love, that they will forever be apart of you. There will always be connection.
This could be a very dangerous situation if it is not equally mutual, abused or taken for granted. That is why it is so important that you are mindful to whom you invest your time, love, and energy. However, if the feelings and power is equally shared...it can be a very beautiful thing.