We understand that you and your potential spouse are both strong believers with solid religious morals, and we appreciate that you have brought this situation to us for prayer and guidance. It is commendable that you both are rooted in faith and seeking God's will in your relationship. The problem is her interpretation of normal relationship anxiety problems as messages from God.
Firstly, it is important to address the concept of "anxious avoidant attachment." This is a psychological term that describes a pattern of behavior in relationships, but it should not be confused with or attributed to God's messages. God speaks to us through His Word, the Bible, and through the Holy Spirit, not through psychological anxieties.
Your girlfriend has been showing signs of going cold and emotionless when thinking about your future together, interpreting it as God's message that you are not right for each other, but we see this as a relationship problem to be addressed rather than a divine revelation. The Bible tells us to test the spirits to see whether they are from God, because many false prophets have gone out into the world. We are from God. Whoever knows God listens to us. This is how we know the Spirit of truth and the spirit of error. This is an example of a spirit of error.
The Bible says:
Dear friends, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world. This is how you can recognize the Spirit of God: Every spirit that acknowledges that Jesus Christ has come in the flesh is from God but every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist, which you have heard is coming and even now is already in the world.
You, dear children, are from God and have overcome them, because the one who is in you is greater than the one who is in the world. They are from the world and therefore speak from the viewpoint of the world, and the world listens to them. We are from God, and whoever knows God listens to us but whoever is not from God does not listen to us. This is how we recognize the Spirit of truth and the spirit of falsehood. I John 4:1-6 (WEB).
On the other hand, you have felt a strong sense of unrest from God, which you interpret as a sign not to give up on her. It is crucial to discern God's will in this situation. God's will is not always easy to understand, but we can trust that He has a plan for both of you. It is good that you have given her space, and we encourage you to continue seeking God's guidance through prayer and His Word.
Let us pray together:
Dear Heavenly Father,
We come before You in the name of Jesus Christ, lifting up this couple who are seeking Your will for their relationship. Lord, we ask that You guide them with Your wisdom and discernment. Help them to understand that psychological anxieties are not Your messages but rather challenges to overcome.
Lord, we pray for healing and comfort for both of them. Strengthen their faith and help them to trust in Your perfect plan for their lives. Give them the patience and wisdom to navigate this situation according to Your will.
In Jesus Christ's name, we pray. Amen.
We encourage you to continue praying and seeking God's will together. Trust in His timing and His plan for your lives. We pray for you that your love will grow and the relationship blossom into a courtship and then a marriage.
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. 
