Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind, Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God.
That is why asking forgiveness is an ongoing process, otherwise king David would be in Hell right no, for he committed a few of those sins.
Not to mention, Christ said if you thunk it, you done it.
So except for Christ continually forgiving you by going to Him, we would all die and go to Hell!
The difference is, I go straight to God through Christ. You think you need a Priest on earth to get absolution which is wrong.
Of course if your Catholic and have enough money you can have your marriage annulled as if it never happened so you are not guilty of adultery.
For us protestants, divorce is the only way out of a marriage, and then only for sexual immorality by the other spouse.