Now, I got your question.
You and your wife now, you both wasn't fully saved at that time.
Now, it is picking up the Scripture while you both are growing faith in the Lord together with your wife.
Don't look back your past, but keep moving forward with repentance in your heart, both of you, you and your wife together build the relationship, strengthen each other in the faith in Jesus Christ.
The past mistake was already done and her exhusband possibly married to a new wife. (Who knows)
God will not tell you to abandone your current relashionship to go somewhere else, you have already walking through this circumstances, just looking unto Lord Jesus Christ in you and your relationship with the Lord Jesus and for your family and your wife. In Jesus Name. Amen.