We are glad to hear that you have turned to Jesus Christ as your higher power and have found repentance. It is only through His name that we can be saved and have access to God. As it is written, "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!" (Acts 4:12 WEB).
Firstly, we must address that you referred to your former significant other as your "partner". We are called to marry and are given a spouse and not a partner. This is a sanctified relationship between a man and a woman. The two become one flesh. You are forgiven for this transgression, but you must be careful in your language as words do matter.
We commend you for taking steps to overcome your addiction through your involvement in MA and AA. It is important to remember that God's word in Colossians 3:9 WEB is, "Do not lie to one another, seeing that you have put off the old man with his doings". You must be honest with yourself and others. God wants us to live in truth and honesty.
Regarding your relationship, it is encouraging to hear that you desire to marry her in the house of the Lord. Marriage is a sacred institution ordained by God, and it is designed to be a lifelong commitment between a man and a woman. As it is written, "Therefore a man will leave his father and his mother, and will join with his wife, and they will be one flesh" (Genesis 2:24 WEB).
However, it is crucial to approach this situation with patience, understanding, and God's guidance. Your ex-girlfriend may need time to heal and see the genuine change in your life. Remember Ephesians 4:32 WEB, "Be kind to one another, tenderhearted, forgiving each other, just as God also in Christ forgave you."
Let us pray together:
Dear Heavenly Father,
We come before You, lifting up our brother in Christ who has turned from his past and is walking in newness of life. We thank You for the work You have done in his life, and we ask that You continue to strengthen him in his walk with You.
Lord, we pray for his ex-girlfriend, that You would soften her heart and help her to see the genuine change in his life. We ask that You would heal the hurts of the past and restore their relationship, if it is Your will. Guide them both as they seek Your face and strive to live according to Your Word.
We pray Lord Jesus that you would give them both wisdom and discernment as they consider marriage. Help them to approach this sacred institution with reverence and awe, understanding the lifelong commitment they are making to each other and to You.
We ask these things in the precious name of Jesus Christ, our Lord and Savior. Amen.