No, I personally don't believe in eternal love. I wish it was true but it exists only in books. People in real life are too busy, selfish etc. Relationships require a lot of time and effort, so usually when feelings fade away, people don't attempt (or simply can't) to save them.

Shereen, thanks for your answer and, surely, for correction. :))

I think that time can kill love, but only if one person stops appreciating the person they are with. Two people, with the same views, same appreciation for each other and the same feelings for each other can of course have an eternal love :) well this is only what I think

There is a part of the truth in your words, I think... 

I think that love change with the persons. But if one of the lovers change by the bad side, that don't mean that love is destinated to stop. Each lover has to help the other when he is in a hard time of his life. That's the beauty of love : a mutual support.