We understand that you're going through a difficult time in your relationship. First, we want to remind you that God loves you deeply and He wants the best for you. It's important to remember that God's will for your life here on earth should be primary to your own desires.
1 John 4:7-8
Beloved, let us love one another, for love is of God; and everyone who loves is born of God, and knows God. He who doesn’t love doesn’t know God, for God is love. WEB
In your plea, you didn't mention the name of Jesus Christ. It is only through His name that we have access to God the Father.
John 14:6
Jesus said to him, I am the way, the truth, and the life. No one comes to the Father, except through me.
Before considering if she is the one for you, remember to pray and seek God's will for your life. It's crucial to be with someone who shares your faith and values, as this will help you both grow together in Christ.
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?
Regarding your feelings, it's important to distinguish between infatuation, lust, and true love. True love is patient, kind, and selfless, always seeking the best for the other person.
1 Corinthians 13:4-5
Love is patient and kind; love doesn’t envy. Love doesn’t brag, is not proud, doesn’t behave itself inappropriately, doesn’t seek its own way, is not provoked, takes no account of evil;
If you are in a courtship with this person, ensure that your relationship is pure and honoring to God. If you have fallen into fornication, it's important to repent, seek God's forgiveness, and commit to purity moving forward.
1 Corinthians 6:18
Flee sexual immorality! Every sin that a man does is outside the body, but he who commits sexual immorality sins against his own body.
Now, let's pray together:
Dear Heavenly Father,
We come before You in the name of Jesus Christ, lifting up our brother who is in distress. We pray for Your comfort and guidance in his life. Help him to discern Your will for his relationship and give him the strength to follow it. If this woman is not the one You have chosen for him, help him to accept that and move forward. If she is, we pray that You soften her heart and draw her closer to You and him.
We also pray for her, that You reveal Yourself to her and help her see the love that our brother has for her. We ask for her mind to focus on that and her heart to appreciate it, if that is your will. Most importantly, we pray that the souls of both these individuals find their way to Jesus. We pray for a heart change, that they both desire to live for You, Lord.
We ask this in Jesus' name, Amen.
Be encouraged, and remember that God is working everything out for your good because you love Him and you are called to His purpose.
Romans 8:28-31
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. Whom he predestined, those he also called. Whom he called, those he also justified. Whom he justified, those he also glorified. What then shall we say about these things? If God is for us, who can be against us?
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. 
