What is "Sanctity of Marriage" Anyways?

I know your not going to believe this but I'm going to say it anyway because its the truth to your answer. Marriage is an eternal principle but needs to be performed in the temple and practiced faithfully in mortality for it to still have the sealing promise in the life after, this marriage bond is eternal too meaning forever and ever and ever. Is it a sin to have while married outside the temple ordinance, nope, but the marriage ends in this life. If you read the bible it says this as well but thankfully the restored gospel has been brought back and now we know the full answer. Again i know your not going to believe this but I think you'll find out some day so I mind as well tell you. sorry if this offended you in any way seriously