It depends how you understand "one flesh". There are two main
views of how to understand it: 1) two people become permanently
one person through a sexual act - if this is so, then we would have
to say that no divorce is possible unless one half of that one new
person-pair dies. 2) two people are joined in a special way
through a sexual act - if this is so, then that joining CAN come to
an end, though it should not.
Jesus appears to hold the second view, because he says that the
joining CAN be broken but it is sinful to cause that breakup.
Jesus says "no one SHOULD separate" those whom God has joined -
ie it is wrong, sinful, to cause the breakup of a marriage. The
Greek has the imperative mood - ie a command or a longing or a wish.
I take it as a command. However, you can't translate it as "no one
CAN separate". The fact that Jesus commands people not to cause the
breakup of a marriage (ie not to break their marriage vows) implies
that it sinful but it is possible.
Paul also appears to hold the second view, because he says you
can become "one flesh" with more than one person.
Paul says that if you go with a prostitute you become "one-flesh"
(1Cor.6.16). He does not say that it only happens with the first
person you have sex with - otherwise it would be OK for a married
person to go to a prostitute because they wouldn't become "one
flesh" with them. According to the context, he is saying that sex is
very special and it involves a spiritual bonding, just as "he who is
joined to the Lord becomes one flesh with him" (v.17), so we should
not take sex lightly because our bodies are a temple of God
(v.19).
Therefore I take "one flesh" to mean a special spiritual
relationship which comes about through sex and which should not be
broken if it has been sanctified by God in marriage. However,
marriages can break up due to the sinful breaking of marriage vows.
This SHOULD never happen, but sadly it does.
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