The highest road would involve requesting your partner to give up the other person, working to meet their needs they felt were lacking, making yourself more attractive to them, winning them over. There are scriptural examples… Hosea initially exposed Gomer and divorced her, God had him seek her out to get her to return to him….even better. Joseph wasn’t willing to expose Mary when she was pregnant and he thought it was by another man.
I would ask you to consider this:
Matthew 18:15-17 (New International Version)
A Brother Who Sins Against You
"If your brother sins against you, go and show him his fault, just between the two of you. If he listens to you, you have won your brother over. But if he will not listen, take one or two others along, so that 'every matter may be established by the testimony of two or three witnesses.' If he refuses to listen to them, tell it to the church; and if he refuses to listen even to the church, treat him as you would a pagan or a tax collector.
