I think that strong and lasting love relationship makes the feeling of true love. Namely, a sense of passion, devotion, faithfulness to your partner, gratitude for what he has in your life. A strong relationship is the result of true love. Many people dream about such love, but leave their partners because he was unable to justify hopes, just changed or he left you or never loved. That's why such relationships and did not fold and crumble because of the lack of this feeling of love to your partner.