On love and loss

Different things at different times provoke different degrees of an emotion from me. But never at any point do they mean nothing at all. 
If I loved you once, I will love for all time. 

Like the angles sunlight falls at, it’s intensity varing noticeably every hour. I am the day that hopes to last forever. The relentless afternoon unfortunately, the 6 o’clock evening softness, the dawn. I am also the illusion of dusk falling, because I am only human. But you know, the sun still shines behind the mountains. Would you call that unfortunate?