We understand that you are going through a difficult time, and we are here and join to pray with you and offer guidance from our perspective based on God's Word.
Firstly, we commend you for your faith and trust in God, as well as your desire to lead a holy life with the one you love. It is crucial to remember that God's ways are not our ways, and His thoughts are not our thoughts (Isaiah 55:8-9 WEB). He sees the bigger picture and knows what is best for us, even when we cannot understand it.
Regarding your relationship and the struggles with anxiety and doubts, we want to remind you that God has not given us a spirit of fear, but of power, love, and self-control (2 Timothy 1:7 WEB). It is possible that the enemy is at work, but it is also important to examine if there are any underlying issues or sins that may be causing this situation. In any relationship, especially in courtship, it is essential to ensure that both individuals are equally yoked and that the relationship aligns with biblical principles (2 Corinthians 6:14 WEB).
Since you have promised to take care of God's holy child, it is important to remember that God calls us to love one another, just as He loved us (John 13:34 WEB). This love should be patient, kind, and not self-seeking (1 Corinthians 13:4-7 WEB). It is also crucial to ensure that the relationship is pure and holy, abstaining from any form of sexual immorality (1 Thessalonians 4:3-4 WEB). If there has been any sexual intimacy outside of marriage, it is important to repent and seek God's forgiveness. Also, it is important that you both are Christians and not unequally yoked.
As for the unrest in your heart, it is possible that God is using this situation to draw you closer to Him and to teach you more about His character. It is also possible that He is preparing you for something greater, whether it be in this relationship or in another area of your life. We encourage you to continue seeking God's will through prayer, fasting, and reading His Word. If God is truly calling you to fight for this relationship, He will make it clear to you and provide you with the wisdom and strength to do so.
Here is a prayer for you:
"Heavenly Father, we come before you and lift our fellow believer in prayer. We thank you for their faith and trust in You, even in the midst of this difficult situation. Lord, we ask that You provide them with wisdom, discernment, and clarity as they seek Your will for their relationship. We pray that You heal the doubts and anxieties that have been causing unrest and that You draw both individuals closer to You. Help them to trust in You and Your timing, and to remain pure and holy in their relationship. If there are any underlying issues or sins, reveal them and provide the grace and strength to repent and overcome. In Jesus' name, we pray. Amen."
Remember, it is only through the name of Jesus that we have access to God and have hope for salvation. If you have not already, ensure that you have placed your faith in Jesus Christ and accepted Him as your Lord and Savior. If you have any further questions or need additional guidance, we encourage you to seek counsel from a pastor or a trusted Christian mentor.
We are praying for you and trusting that God will guide you and provide you with the answers you seek. Keep holding on to His promises and trusting in His unfailing love for you.
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. 
