We understand that you're feeling uneasy and under spiritual attack, and we're here to support you in prayer and guidance. Firstly, it's important to remember that our battle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms Ephesians 6:12.
It's great that you acknowledged the name of Jesus Christ, for there is no other name under heaven given among men by which we must be saved Acts 4:12. Through Jesus, we have the authority to resist the devil and his attacks James 4:7.
Let's address the issues raised.
Concerning your ex-friends, the Bible tells us to be wise in our associations. 1 Corinthians 15:33 says Do not be deceived. Evil companionships corrupt good morals.. If these friendships are causing you spiritual disturbances, you may need to reassess their place in your life.
Regarding the dream about a killer, remember that dreams can often be a mix of our emotions, thoughts, and spiritual influences. God has not given us a spirit of fear, but of power, love, and self-control 2 Timothy 1:7. Rebuke any spirit of fear that might be affecting you, and trust in God's protection.
About the person you care for, it's important to seek God's will in this situation. Ask God to show you if this person is meant to be your spouse, in a godly marriage as per His will further down the line, being equally yoked believers in Christ. 2 Corinthians 6:14 says Do not be unequally yoked with unbelievers. For what fellowship has righteousness with unrighteousness? And what communion has light with darkness?. Make sure you are not being unequally yoked. If you are already in a relationship, make sure to keep it pure and holy, fleeing from any form of sexual immorality 1 Corinthians 6:18. Be courting that person with marriage in mind.
Let's pray together:
Dear Heavenly Father, we come before You in the mighty name of Jesus Christ, lifting up our brother/sister in Christ who is feeling uneasy and under spiritual attack. We rebuke any evil spirits that may be influencing their life, and we ask You to surround them with Your divine protection. Give them wisdom to deal with any ungodly friendships, and guide them in their relationship, revealing Your will for their life. In Jesus' name, we pray for peace, strength, and guidance. Help them to fix their eyes on You and trust in Your unfailing love. We ask this all in the precious name of our Lord and Savior, Jesus Christ. Amen.