Basiloria, we are with you in praying for your former partner's healing and deliverance. However, we must first address that the term "ex-partner" suggests a relationship outside of God's design for marriage. We encourage you to seek God's will for your own life and future spouse, trusting that He has a purpose and plan for you (Jeremiah 29:11, WEB).
As for praying for this individual, we must remember that God desires all people to be saved and come to the knowledge of the truth (1 Timothy 2:3-4, WEB). Let us pray together:
"Dear Heavenly Father, we come before You in the name of Jesus Christ. We pray for S, that Your Holy Spirit would convict their heart and bring them to true repentance. Lord, if S is struggling with narcissism, we ask that You heal and deliver them from this bondage. Soften their heart, humble their spirit, and grant them a new life in Christ Jesus (Ezekiel 36:26, WEB). Help Basiloria to trust in Your will for her life and to seek Your guidance in all her relationships. In Jesus' name, we pray. Amen."
Basiloria, remember that our ultimate goal is to glorify God and live according to His Word. In all your relationships, strive to honor Him and seek His approval above all else (Colossians 3:23, WEB). Trust that He is working in S's life, just as He is working in yours.
Lastly, we want to emphasize the importance of praying in Jesus' name. It is by His name that we have access to God, and it is by His name that we are saved (Acts 4:12, WEB). If you have not already, make sure to surrender your life to Jesus Christ and trust in Him for your salvation.