We understand your concern for your boyfriend, but we need to address several issues in your request. First, it's important to know that our help comes from the name of the Lord Jesus, not from any other name or source. The Bible states in Philippians 2:10-11 WEB:
At the name of Jesus every knee should bow, of those in heaven, those on earth, and those under the earth, and that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father.
First, we must correct in the fact that you are not currently married to this man. Therefore, you should be praying for a Godly spouse. This is very different from having a boyfriend.
Our first recommendation is to pray for your boyfriend's salvation and deliverance. This is a spiritual battle and only Jesus is capable of outright saving and delivering your boyfriend. Remember, in John 3:16-17 WEB:
For God so loved the world, that he gave his one and only Son, that whoever believes in him should not perish, but have eternal life. For God didn't send his Son into the world to judge the world, but that the world should be saved through him.
The problem with your request is you are too focused on the problem, not the solution. God is our deliverer and He will heal and deliver your boyfriend from this woman and witchcraft. Focus on the promises of the Bible and believe you receive what you are praying for during the prayer.
Let's pray together:
Dear Heavenly Father,
We come before You in the mighty name of Jesus, seeking Your intervention in this situation and placing our every trust in You. We ask for a Godly spouse in our life. We pray for your boyfriend's deliverance and salvation from this woman and witchcraft. We pray for the destruction of the works of the devil in his life and command the spirits of bewitchment to leave and never return in the mighty name of Jesus.
We ask that You surround your boyfriend with Your divine protection in accordance with Psalms 91:4 WEB:
He will cover you with his feathers. Under his wings, you will take refuge. His faithfulness is your shield and rampart.
Since you are tired of this situation, we ask that You grant your boyfriend supernatural strength to break free from this bondage and renew his mind in accordance with Romans 12:2 WEB:
Don't be conformed to this world, but be transformed by the renewing of your mind, so that you may prove what is the good, well-pleasing, and perfect will of God.
Furthermore, we need to correct and rebuke you for possibly being involved in sexual immorality. The Bible is clear that sex outside of marriage is fornication and a sin. It is only appropriate for a man and a woman to be together in this way in marriage. I Corinthians 6:18 WEB:
Flee sexual immorality! Every sin that a man does is outside the body, but he who commits sexual immorality sins against his own body.
We ask that You grant him and you wisdom and discernment to identify and resist such influences in the future, in accordance with James 1:5 WEB:
But if any of you lacks wisdom, let him ask of the giving God, who gives to all liberally and without reproach; and it will be given to him.
Finally, we pray that you and your boyfriend find spiritual strengthening and encouragement in the Body of Christ and that you both grow in the love and knowledge of the Lord Jesus Christ in accordance with Philippians 4:13 WEB:
I can do all things through Christ, who strengthens me.
We thank You for hearing our prayers and we ask all these things in faith, believing that we have received and trusting You to manifest them in Jesus' name. Amen.
Please be mindful of God's purpose and timing in your boyfriend's life. We encourage you to seek God’s guidance on this courtship and possible future marriage to a Believer. This may not be the person that God has in store for your life. You should also be open to seeking advice and guidance from mature Christians and mentors in your life.
Prayer Focus: God, Thank You. Thank You for loving me. God, I ask You in Jesus’ name bless me with everything that I stand in need of and everything You want me to have. Bless me to know You in truth, fall in love with You with all my heart, mind, soul, body, and strength and never fall out of love with You. Bless me to have an ever growing closer stronger, more intimate relationship with You. Bless me with the love, desire, strength, and the spirit of obedience to always delight myself in You, seek first Your kingdom, and Your righteousness. Help and strengthen me God to always respect and obey You. Bless me to trust You with all my heart, acknowledge You in all my ways, and lean not to my own understanding. 
