For we must all appear before the judgment seat of Christ; that every one may receive the things done in his body, according to that he hath done, whether it be good or bad.
-I Corinthians 5:10, KJV
When caught in marital infidelity, the Christian response to such actions is not to claim the devil or one’s spouse made one do it.
The true Christian response to such sin is to fully own one’s actions (and repent).
Considering this verse from I Corinthians 5, spiritually diagnosing who is responsible for marital infidelity really is a simple task that will be done either on earth or–and probably more severely–in Heaven:
Was the Devil the one who committed adultery here? No.
Was it your spouse who committed adultery here? No.
Were you the one who commit adultery here? Yes.
We all ought to know that committing adultery is a very bad thing. God prohibits committing it explicitly in the Ten Commandments (see Exodus 20:14 for those needing a refresher).
Who will God hold responsible for doing this very bad thing–i.e. committing adultery–according to I Corinthians 5:10?
The person who did the deed.
Not their spouse.
Not the devil.
The adulterous spouse will be held responsible–fully–for his or her sinful actions.
It really is that simple: The true Christian response is to hold the person taking the sinful action accountable for acting sinfully.
Any message that says otherwise is neither godly or Christian.