I don't think there's any reason not to. We are ready to believe such commitment at the moment, whatever change may happen afterwards. As for the belief in an everlasting love, that's another thing.
"Everlasting Love" is a song written by Buzz Cason and Mac Gayden, originally a 1967 hit for Robert Knight and since remade several times, most successfully by the Love Affair, Carl Carlton and Sandra. In 1989, U2 released a version of "Everlasting Love" as a B-side on various formats of the "All I Want Is You" single.