you are right mr. lukas :), what about this?
beings non-created (God, Universe..... bla bla ), the word for talk about their duration is -eternity- without beginning and end in the time line.
beings created, beings with beginning and end, they can only dream with forever, because they have begining and they only can desire -not have an ending- or, maybe, desire be like some kind of food, and not have a date caducity :P
forever=no date caducity, and with this sense, love forever (or frienship) is similar to: i will love you, while that our love not be stale, unhealthy, distasteful....
sounds more real that an inconditional love, friendship......, or an unbreakable contract, right?
end of my paranoid