Forever is a lot shorter than forever ..... When someone says something is forever they probably mean, "as long as I think this way".
Especially for things like I'll be your friend forever, or I'll trust you forever.... Mostly they means something like, as long as i feel this way :)
Things that really are forever are the things that never really were, like a friend you made on a train but never kept in touch, someone that you knew for a short time but then went apart ... memory of a rainbow all the way across the sky, a walk on a cool breezy evening, across the green forever fields ... sailboats far in the ocean, peaceful, surreal, eternal.
Dreams are forever too .. for as long as you want them.
These and the divine presence are the only thing forever. Everything else get's washed away in the huge tide of Time.