Why does love have to fade?

I just don't get it. Is it hard to stay inlove with the person you love? Cause for me, it's not. I have been through a lot.. But yet here I am.. Still inlove with him. But I guess for him, it's just not that easy. 

I just feel sometimes that his love for me fades in a way that I feel it. Shorter messages, not too much attention, and I feel like he's okay when he doesn't get to see me throughout a week. What kills me is that he doesn't have any idea of all these things. 

Things that will make you happy.. I would do that in a heartbeat baby. But I guess you have a different point of view. :(