It may sound strange but I think love is everlasting but relationships aren't. It is the reason I decided not to get married. Marriage isn't sharing your life with someone else. Marriage is creating a life with someone else. And any artist and creator will tell you in the creation process you are in the moment. So with marriage you have to trust that person from moment to moment to moment.
Yes, we can truly love someone. We can admire them. They could give us goosebumps when they walk out the shower looking like a leading character in a romance novel. But the question remains, "Can I create a happy fulfilled life with this person?