We understand that you're going through a difficult time in your relationship and we're here to pray and provide biblical guidance. Firstly, let's remember that God's will is for us to live in peace and harmony with one another. The Bible tells us in Romans 12:18, "If it is possible, as much as it is up to you, be at peace with all men."
However, we notice that you didn't mention anything about being Christian, Jesus, or your faith. We want to remind you and encourage you that it is only by the name of Jesus that we can approach God. Acts 4:12 tells us, "There is salvation in no one else, for there is no other name under heaven given among men by which we must be saved." This is why knowing Jesus personally as Lord and Savior is essential to your prayers being heard. If you haven't made that decision, or if your girlfriend hasn't, now is the time to consider it. It is the first step in the right direction together.
Regarding your relationship, we want to encourage both of you to seek God's will. The Bible is clear that God desires that those who are in a relationship be in courtship leading to marriage, that is, a lifelong commitment between a man and a woman. We are reminded 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?" This means that a couple should help one another grow in their faith. Make sure that both of you are believers of Christ, and the Word of God and are on the path of becoming better disciples and servants of Christ Jesus.
Now, let's address the issues in your relationship. Ephesians 4:29 tells us, "Let no corrupt speech proceed out of your mouth, but such as is good for building up as the need may be, that it may give grace to those who hear." Arguing and saying things you do not mean can be hurtful and damaging to a relationship. Instead, speak words that build up and encourage one another. Remember Ephesians 4:32, "Be kind to one another, tenderhearted, forgiving one another, even as God for Christ's sake has forgiven you."
It's also important to remember that forgetting the past can be difficult, but God can help you move forward. Isaiah 43:18-19 says, "Don't remember the former things, and don't consider the things of old. See, I am doing a new thing! Now it springs forth. Do you not perceive it? I will even make a way in the wilderness, and rivers in the desert."
Regarding your girlfriend's parents, it's important to honor and respect their feelings. The Bible tells us in Exodus 20:12, "Honor your father and your mother, that your days may be long in the land which Yahweh your God gives you." Pray that they will see the positives in your relationship and that their hearts will be open to accepting you both.
Let's pray together:
Dear Heavenly Father,
We come before You today, lifting up this couple to You. We pray that they both would come to know Jesus Christ personally and intimately, that their relationship would be centered around Your will and Your Word. We ask for Your forgiveness for the hurtful words they've spoken to each other. Help them to forgive one another and to move forward in grace, humility and unity. Help them to seek wholesome healthy words that would help them both to bond, grow, believe, and have faith in each other. We pray for her parents, that they would have understanding and accepting hearts. Guide this couple, Lord, as they seek Your will for their future. If it would be Your will that they would become man and wife, then we pray for a happy healthy Godly marriage.
In Jesus Christ's name, we pray. Amen.