Love is not a feeling. It is a decision. A mere source of willpower to do an act of kindness to a party you love.However, it can be driven by emotions but it doesn't last. We humans will tend to get tired and sick of things once in a while after doing the same old thing. So, to cultivate this long-lasting love in a successful relationship, I believe it is something that requires determination and commitment.Long lasting love comes from a personal willingness to serve the other party with his/her best interests at heart, it does not fade with feelings but increases as it is given away.
Think of the Creator of love. Our God, Jesus Christ. He himself so filled with love and compassion, that He even desires to lavish His love on us. God is the greatest example of eternal love. Imagine if God were to love us by feelings? Does it mean He will treat us as and when He likes, spite us, punish us, whenever He feels angry or jealous? What would have become of us? I doubt any human will live the face of the earth. God created humans to love us and He is committed to love us. He is a meticulous God, none of His creation is of no purpose. So He created us with careful planning to love us consistently throughout our whole life. In this world, where change is a constant, we can rest in blessed assurance in a God who never changes. He is that God who is faithful in all that He does. He promises to love us and He will. Even though we are faithless, He will still be faithful because He cannot break His own promises to us. That would make Him a liar. Someone inconsistent.
We, Humans are wired in a way to think about eternal things. Many want to live forever, they want to spend the forever with their loved ones. If God didn't create us this way, why would we even think of 'forever'. Because humans are meant to live forever. Our death on earth is just the beginning of a new life be it in hell or heaven and that would be forever. But we can trust in the promise of our God that He promises us salvation that whoever who believes in Him will be saved from the pits of hell.
God is the ultimate source of love. In Him, we can find eternal love, love that doesn't fade, love that is consistent, love that is forever and He will love you always. In order to build that relationship with long-lasting love, I believe the key is to involve Your creator in that relationship. He can fuel your lives with that passion to love each other just that He has loved us and when we love, we are pleasing God.
Love, something so complex, can kill and destroy , can edify and encourage. It can be accompanied with emotions like hate, jealousy and etc. But that makes it impure. Pure love is patient, kind, doesn't envy, doesn't boast, not rude, not self-seeking, keeps no record of wrong. It always protects, trusts, hopes and perseveres.