On one hand, you care about this person and want to remain committed to the relationship through thick and thin.But on the other hand, you realize how important it is to protect and take care of yourself, and you know that there comes a time when you have to be willing to say, “Enough is enough.” The question is, When is that time?Some believe that, once married, a person is never free to marry again unless their spouse dies – and no exceptions.Others believe God doesn’t condemn us to be single forever if we, or our former spouse, made mistakes or behaved badly.
But if this person who has hurt you has previously shown time and again a commitment to you and to your relationship—if this person has earned your trust throughout the time you’ve been together—then you may decide that the person deserves a second chance and that you can offer forgiveness for a momentary lapse. If you can tell that your partner has achieved genuine growth and insight from this painful experience, then you may want to at least hear out your partner’s request for a second chance.
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Ok, here's some information I have gathered about second chances.
If your partner left the relationship there is a reason they did.
Whether or not they are honest about it, they may want to come back for multiple reasons.