When two people love each other, it usually starts of with a spark. This spark is what causes two people to start having special feelings for each other. Later on these feelings will eventually develop into the special thing we call love.
Now that love is born we can see what this spark does for us. As the love continues to grow stronger it is widely speculated that the spark would grow stronger as well but thats not always the case.
Sometimes the spark will somehow disappear. People start to question whether they still love each other or not. This usually leads to couples breaking up because they don't know if they still love each other however I have my own opinion on this. Just because people don't feel anything for each other, it dosen't mean the love is gone. Sometimes maybe they got to the point were they know each other so well that they just got bored or maybe they don't have time for each other anymore that they end up forgetting about their love but who knows maybe deep down they just miss each other.
So we can see how this spark affects us when we love. Even though this spark is gone, it dosen't mean that the love is gone. If you really love a person then things such as distance should not matter because together the love of two people will be enough to overcome any obstacle.