I agree there is a big difference between like and love, and though love is thought to abide, conquer all, overcome all obstacles, be blind, and many other things, the truth is love is just an emotion.

Can two people sustain one common emotion for eternally? Common, that's expecting way too much if you ask me. But if they are also best friends and lovers, they don't have to be matched love for love through every minute of their relationship. I believe a lasting relationship has many facets and phases, and love and like, while vital components, are only two of them. IMO