We understand your concern for your boyfriend, but we need to address several things before we pray. First, it is important to know that God's design for relationships is that they be between a man and a woman within marriage. It is also important to remember we must be equally yoked in our beliefs.
Be not unequally yoked with unbelievers. For what fellowship has righteousness with iniquity? Or what communion has light with darkness? 2 Corinthians 6:14
We are concerned that you are in a relationship with an unbeliever who is experiencing demonic oppression or possibly possession. This is a dangerous situation spiritually, physically, and emotionally. We advise you to reconsider this relationship and pray for God's guidance in your life. We also want to know why you are not mentioning the name of Jesus Christ. This is the most important aspect of your prayer request.
There is no other name by which we can be saved and go to God the Father.
For there is one God, and one mediator between God and men, the man Christ Jesus. 1 Timothy 2:5
Be it known unto you all, and to all the people of Israel, that in the name of Jesus Christ of Nazareth, whom ye crucified, whom God raised from the dead, even in him doth this man stand here before you whole. This is the stone which was set at nothing of you the builders, which was made the head of the corner. There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved! Acts 4:10-12
We also advise you not to confront demonic forces alone. This is something that should be handled by someone experienced in spiritual warfare, such as a pastor or elder in the church.
We will be praying for your boyfriend's deliverance from this demonic oppression or possible possession, but we will also pray for your spiritual strength, guidance, and safety as well.
Father, we come before you in the mighty name of Jesus Christ, lifting up this dear sister and her boyfriend. God, we pray for his deliverance from this demonic oppression, that you will set him free from this bondage, and that he will come to know you as his Lord and Savior. We pray for your protection over this sister, that you will guard her heart and mind, and give her the wisdom and discernment to navigate this situation. We pray that you will guide her steps, and that you will bring godly counsel into her life. We ask all of this in the mighty name of Jesus Christ, our Lord. Amen.
Finally, we admonish you to continue to study God's word, the Holy Bible, and grow in your faith. Seek out a Bible believing local church and Christian fellowship for support and guidance. Seek guidance from the Holy Spirit and learn His voice and leading. Remember that God will never contradict His written word, the Holy Bible.