Raufram, first we need to address a few things in your request before we begin to pray together. Most importantly, you did not mention the name of Jesus Christ, Jesus, or Christ or an abbreviation for it. The Bible says in:
Acts 4:12 "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."
And in 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."
So let us pray in the name of Jesus Christ and ask that God's will be done in your life and the life of your former girlfriend.
In considering your prayer request you need to realize that you have lost both the relationship and her friendship. It is unfortunate and sad that she has unfriended and blocked you. From the information you provided it is unclear why this happened. It has happened and it is imperative that you respect her boundaries and wishes. This does not mean that things will not change however the timing of such is up to God not us and timing is important. Jesus said in Romans 8:28:
"We know that all things work together for good for those who love God, to those who are called according to his purpose."
We are all called to be married and have family and do so with God. God can, will and has forgiven even major sins. As Christians we all have sinned and fall short of the glory of God but it is only in the name of Jesus that we can even come before God to ask.
God will touch her heart but it may not be in a way we imagine. It is so very important to understand this as Christians. God sometimes says No, Not yet or Maybe later in His timing. We need to accept this a work on doing God's will. We should pray for marriage and that this will become what God want you to do. We need to pray for a deeper relationship with God so that we can do God's will.
You've expressed your desire to treat her and her son rightly. That is an honorable thing to do and we should all do so. But is this what she wants we do not know.
If there is sin in your life that is causing you not to do God's will or see God's will then it needs to be addressed and worked on. Let us pray this prayer with and for you.
Dear Heavenly Father,
We come before You in the name of Jesus Christ, asking for Your will to be done in the lives of Raufram and his ex-girlfriend. Lord forgive them both for their sins in their lives and relationship. Lord, we ask that You soften her heart and that You work in both of their lives, not for their comfort but for Your Will to be done in them. Draw them closer to You as fit for Your purposes in each or together as You will .
We avert any timing of our own doing based on our desires like mentioned above to have happened yesterday, today, or tomorrow not in our will but in God the Father's will.
We pray that You help Raufram to focus on Your will and deny himself, pick up his cross daily. Help him to live up to Your standards, fleeing from any temptation or wrong intentions.
In the name of Jesus Christ, the only door to God and eternal life and salvation, amen
Offer encouragement:
As for you Raufram, stay strong in the faith, and persevere in prayer. Trust that God is well-acquainted with your feelings and struggles. He cares for you and will be with you in all you do. Unfair as the situation might feel, God can use everything for your good and His will! And as difficult as it might be, you need to practice and take to heart verses like:
James 1:2-4 "Count it all joy, my brothers, when you fall into various temptations, knowing that the testing of your faith produces endurance. Let endurance have its perfect work, that you may be perfect and complete, lacking in nothing."