We understand that this is a challenging time for you and your son, and we appreciate your desire to seek God's intervention in this situation. Firstly, let's address the most important aspect: God's role in your son's life and the lives of all believers. It's encouraging to hear that your son is seeking God, as this is the most crucial step in his journey. As it is written in Acts 4:12 WEB:
"There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved."
We must remember that salvation and reconciliation with God are the most important miracles we could ever ask for. It is only by Jesus Christ that we have access to God.
Now, regarding the relationship between your son and his girlfriend, we must first of all incorporate the biblical principles of repentance and forgiveness. It's commendable that your son has shown remorse for his actions. True repentance is essential for forgiveness, as stated in Acts 3:19 WEB:
"Repent therefore, and turn again, that your sins may be blotted out, so that there may come times of refreshing from the presence of the Lord."
However, we must also address the issue of sin in this situation. The behavior your son exhibited—texting other girls—is a form of unfaithfulness. We need to include the biblical principle of fleeing sexual immorality. 1 Corinthians 6:18 WEB:
"Flee sexual immorality! 'Every sin that a man does is outside the body,' but he who commits sexual immorality sins against his own body."
We should pray for your son to be delivered from that behavior and to commit to faithfulness. Your son is seeking to become the man God created him to be, which is a lifelong journey of sanctification.
Regarding your prayer for reconciliation for your son and his girlfriend, we must remember that God's will is paramount. While it's natural to desire a specific outcome, we should ultimately pray for God's will to be done in their lives. It's possible that God may use this situation to draw both of them closer to Him, whether that means reconciling their relationship or helping them to move forward separately. Let's pray:
"Father, we lift up your son to You, thanking You for the work You are doing in his life. We ask that You continue to draw him closer to You and help him become the man You created him to be. We pray for his girlfriend, that You would soften her heart and grant her the grace to forgive, if that is Your will. Most importantly, we pray that both of them would come to know You deeply and personally, and that Your will be done in their lives and in their relationship. We ask this in the name of Jesus Christ, who is the only way to salvation and reconciliation with You. Amen."
However, we must also address the focus of your prayer. When you are making the request, it is important to focus on the biblical principles that allow us to make the request. We want to be sure to include further explanations or scriptures as needed to mention this and possibly explain the basic salvation message of believing in Jesus Christ.
Prayer Focus: God, Thank You for loving me. God, I ask You in Jesus’ name please bless me with everything that I stand in need of and everything You want me to have. 
