We understand that you're going through a difficult time, and we want to remind you that God cares about your pain and the details of your life. Firstly, we want to address that the term girlfriend is not used in the Bible. The courtship should be between a man and a woman with the goal of marriage and the marriage should be between a man and a woman. Fornication is a sin as well, and we should be mindful of temptation and not willfully place ourselves into the path of temptation.
In 1 Corinthians 7:1,2 it is written "Now concerning the things about which you wrote: 'It is good for a man not to touch a woman.' But because of sexual immoralities, let each man have his own wife, and let each woman have her own husband."
But we have a good report that you are in anguish and sorrow over this situation and you are asking for God's help.
We are reminded of the story of Hannah in 1 Samuel 1:10 where it is written "She was in bitterness of soul, and prayed to Yahweh, weeping bitterly." This shows us that it's okay to be honest with God about our pain.
While it's important to acknowledge your feelings, it's also crucial to surrender this situation to God and trust in His will. Remember, God's will is always for our good and His glory, as it is written in Romans 8:28,29 "We know that all things work together for good for those who love God, to those who are called according to his purpose. For whom he foreknew, he also predestined to be conformed to the image of his Son, that he might be the firstborn among many brothers."
We also want to remind you that God's will is for us to be pure and holy, as it is written in 1 Peter 1:15,16 "But as he who called you is holy, you yourselves also be holy in all of your behavior; because it is written, 'You shall be holy; for I am holy.'"
Let's pray together:
"Father, we come before You, lifting up our brother in his time of need. We ask that You would strengthen his faith and comfort his heart. Lord, we know that You see his pain and that You care about every detail of his life. We pray that You would work in this situation according to Your will. We ask that You would either reconcile this relationship or give our brother the strength to move forward in Your grace. We pray for his girlfriend that you give her wisdom and discernment in this difficult time as well. If this courtship is not from You, we pray that you show them both and help them to move on with Your purpose for their life. We pray that they do not dwell on their sorrow and that they can forgive each other for any wrongdoing. We rebuke any fornication that may have occurred and ask God for forgiveness for these two in their courtship. We pray for their sanctification through your Word. In Jesus' name, we pray. Amen."
Lastly, we want to encourage you to seek God's face during this time. Use this opportunity to draw closer to Him, to study His word, and to grow in your faith. Remember Psalm 147:3 where it is written "He heals the brokenhearted, and binds up their wounds." Trust in Him, and He will see you through.
We also want to remind you that it is important to be equally yoked with a fellow Christian Believer. It is written in 2 Corinthians 6:14 "Don't be unequally yoked with unbelievers, for what fellowship have righteousness and iniquity? Or what fellowship has light with darkness?" It is important that they share the same values and beliefs.
In regards to your previous comment that you hope that God will consider healing and reconciling this relationship, we want to remind you that God always wants what is best for us, as Romans 8:28,29 says. His desire is for us to be conformed to the image of His Son. Sometimes, that means removing things from our lives that are not His best for us. We encourage you to surrender your desires to Him and trust in His goodness and sovereignty.
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. 
