Matthew 19:
5And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh?
6Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.
7They say unto him, Why did Moses then command to give a writing of divorcement, and to put her away?
8He saith unto them, Moses because of the hardness of your hearts suffered you to put away your wives: but from the beginning it was not so.
9And I say unto you, Whosoever shall put away his wife, except
it be for fornication, and shall marry another, committeth adultery: and whoso marrieth her which is put away doth commit adultery.
The exception clause does not imply that divorce is "ok". It just states that remarriage will not be counted as adultery. Forgiveness and reconciliation is always the right thing to do...
Mark 11:26
“But if ye do not forgive, neither will your Father which is in heaven forgive your trespasses.”