I don't know if this song is necessarily about heaven, but the verses definitely describe an imaginary world where his dead loved ones are still alive, and the person he loves, loves him back. He only wakes up out of this daydream when he realizes it's not real by the "taste of the tears", and how he can't explain how this wonderful person could have loved him. This is the "moment" of realization, it "won't let you down" because you always have to come back to reality at some point, no matter how sad it is.
If this song doesn't give you the chills I question your status as a human being.
I don't know if this song is necessarily about heaven, but the verses definitely describe an imaginary world where his dead loved ones are still alive, and the person he loves, loves him back. He only wakes up out of this daydream when he realizes it's not real by the "taste of the tears", and how he can't explain how this wonderful person could have loved him. This is the "moment" of realization, it "won't let you down" because you always have to come back to reality at some point, no matter how sad it is.
If this song doesn't give you the chills I question your status as a human being.