We understand your concern for your boyfriend's health, Kaumemai, and we will join you in prayer. However, we want to remind you that our faith is in God alone, and we should avoid placing blame on things like black magic. The Bible tells us, "For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places" (Ephesians 6:12, WEB).
First, let's pray for your boyfriend's health:
Dear Heavenly Father, we come before you in Jesus' name, lifting up Kaumemai's boyfriend to you. You are the Great Healer, and we ask that you touch his body right now. Heal him from the sore on his leg, from malaria, and from diarrhea. Restore his appetite and strengthen his body. We rebuke every spirit of infirmity attacking him, and we ask that you surround him with your protective and healing presence. In Jesus' name, we pray. Amen.
We also want to encourage you with God's Word: "Is any sick among you? Let him call for the elders of the church, and let them pray over him, anointing him with oil in the name of the Lord, and the prayer of faith will heal him who is sick, and the Lord will raise him up. If he has committed sins, he will be forgiven" (James 5:14-15, WEB).
As you continue to pray for him, also remember to trust in God's will and His power to heal.
Lastly, Kaumemai, we noticed that your request did not mention the name of Jesus. We want to remind you that it is only through Jesus Christ that we have access to God. The Bible tells us, "For there is one God, and one mediator between God and men, the man Christ Jesus" (1 Timothy 2:5, WEB). If you haven't already, we encourage you to accept Jesus Christ as your Lord and Savior, and to pray in His name.
If you and your boyfriend are not yet married, we encourage you both to consider the sanctity of marriage as described in the Bible. As you continue your relationship, let it be with the goal of a God-honoring marriage. May God guide and bless you both.