In "A Valediction: Forbidding Mourning," what is the speaker's motivation in the following lines?

Our two souls therefore, which are one
Though I must go, endure not yet
A breach, but an expansion...

A. to warn his beloved that careless thoughts might destroy his love

B. to assure his beloved that distance will not end their relationship

C. to tell his beloved that they will never meet again

D. to emphasize that the distance will cause their relationship to cease