Dishonesty is a difficult issue to address in a relationship. It's important to approach the situation with love, understanding, and open communication. The Bible encourages honesty and warns against lying and deceit. In Ephesians 4:25, it says, "Therefore, having put away falsehood, let each one of you speak the truth with his neighbor, for we are members one of another." 

First, pray for guidance and wisdom in dealing with this situation. Then, find an appropriate time to have an honest and open conversation with your partner. Express your concerns and feelings, emphasizing the importance of truthfulness and trust in a relationship. Encourage them to share their thoughts and provide an opportunity for them to explain their actions. 

If your partner continues to be dishonest and shows no willingness to change, it may be necessary to seek further guidance from a trusted counselor or spiritual advisor. Remember, forgiveness and grace are important aspects of a relationship, but trust needs to be earned and maintained for a healthy and thriving partnership.