We understand that you're going through a difficult time, and we want to lift you up in prayer and provide biblical guidance. First, we want to commend you for treating this young woman with kindness and respect, as Ephesians 5:25 tells us, "Husbands, love your wives, just as Christ also loved the assembly and gave himself up for her." While this verse applies to husbands, the principle of loving and respecting women as Christ loved the church should guide all of our interactions with the opposite sex. However, we need to address a few things in your request.
It's important to remember that it's not our job to make someone like us or love us. We can't control their feelings or actions. Even if you treat her kindly, her response is ultimately up to her. We should always seek to please God rather than people and place our identity firmly in Christ. As Colossians 3:23-24 says, "Whatever you do, work heartily, as for the Lord, and not for men, knowing that from the Lord you will receive the inheritance as your reward. You are serving the Lord Christ."
Additionally, it's concerning that you feel as though nobody cares about you. It is our desire that you find your value and worth in Christ. As 1 Peter 2:9 says, "But you are a chosen race, a royal priesthood, a holy nation, a people for God's own possession, that you may proclaim the excellence of him who called you out of darkness into his marvelous light." Your value is not determined by others but by the fact that you are made in the image of God and that Jesus Christ loved you enough to die for you.
Regarding your heartbreak, know you are not alone. In Psalm 55:22 it says "Cast your burden on Yahweh, and he will sustain you. He will never allow the righteous to be moved." You are not alone.
Regarding your request for prayer over this young woman, we must remember that God desires for us to have relationships that honor and glorify Him. In 2 Corinthians 6:14, it says, "Don't be unequally yoked with unbelievers, for what fellowship have righteousness and iniquity? Or what fellowship has light with darkness?" If this young woman is not a believer in Jesus Christ and not actively pursuing a life that honors God, then you should consider whether this relationship is truly God's will for you. God's desire is for you to be in a relationship with someone who shares your faith and loves Him first and foremost.
Let's pray together:
Heavenly Father, we lift up this dear brother in Christ to you. We ask that you heal his heart and fill him with your peace. Help him to find his value and worth in you alone, and not in the opinions of others. We pray that you would guide him and give him wisdom in his relationships. We ask that you would bring a godly woman into his life, who loves you first and foremost and who will encourage him to grow in his faith. If you would allow these two to be together, then we pray that you would let her see and appreciate his actions. But if it is not your will, then we pray that you would help him to move forward and trust in your plan for his life. In Jesus' name, we pray. Amen.
We encourage you to continue to pursue Christ and to trust in His plan for your life.
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. 
