We understand that you are seeking prayer for discernment and reassurance in your relationship, and we are here to pray with you and provide biblical guidance. First, we want to address that the term "partner" is often used to describe a variety of relationships, but as believers, we should seek God's will for our relationships.
First, God has ordained marriage between a man and a woman as the foundation for intimate relationships. God created marriage for companionship, procreation, and as a picture of Christ's relationship with the Church (Genesis 2:18-24, Ephesians 5:22-33, Malachi 2:15).
We need to understand that God's view of marriage is that it is a holy union between a man and a woman (Mark 10:6-9). If you are living together with children and not married, we encourage you to consider God's plan for your relationship.
The Bible tells us, "Do not be unequally yoked with unbelievers. For what partnership has righteousness with lawlessness? Or what fellowship has light with darkness?" (2 Corinthians 6:14). While it is not clear whether the man is a believer or not, this verse emphasizes the importance of being aligned with someone who shares your faith.
Next, the Bible clearly teaches against sex before marriage or sex outside marriage. If you are a Christian Believer, make sure you abstain from sex before or outside marriage. If sex before marriage has occurred, then it is fornication and you need to repent to God for forgiveness. The Bible tells us, "For this is the will of God: your sanctification, that you abstain from sexual immorality, that each one of you know how to possess himself of his own vessel in sanctification and honor, not in the passion of lust, even as the Gentiles who do not know God" (1 Thessalonians 4:3-5).
Regarding his personality disorder, it is important to approach this with compassion and understanding. However, it is also crucial to set boundaries to protect yourself and your children from harm. The Bible teaches us to be wise and discerning (Matthew 10:16, Romans 12:2).
If he was mean to you for several months, you need to set boundaries to make sure he does not have access to you or your children if he is abusive in any way (verbally or physically). The Bible does not advise anyone to stay in a dangerous or life-threatening situation. They should get out to protect themselves or their children. (Proverbs 22:3).
The Bible tells us, "And now, brothers, I command you by the Lord Jesus Christ to stay away from every brother who leads an unruly life, not one that walks according to the tradition received from us" (2 Thessalonians 3:6).
We must also address that you did not mention Jesus Christ or praying in Jesus' name. It is only by the name of Jesus that we have access to God. We must pray in Jesus' name for God to hear our prayers. And we are saved only in the name of Jesus Christ. The Bible tells us, "In him we have redemption through his blood, the forgiveness of our trespasses, according to the riches of his grace," (Ephesians 1:7). And that, "whoever will call on the name of the Lord will be saved" (Romans 10:13). And that we "come to the Father" in the name of Jesus (John 14:6).
Please consider what has been shared. We need to examine our lives and make sure we are aligned with God's will. God's ways are always best. Trust in Him and follow His ways.
Let us pray for you:
Dear Heavenly Father,
We come before You in the name of Jesus, lifting up our sister who seeks Your guidance and discernment in her relationship. Lord, we pray for Your will to be done in her life and in the life of her relationship. We pray You would convict her heart and his heart if they are not married but are having sex. We pray You provide a way for them to be married if they are to stay together. We pray for Your will to be revealed to both of them.
We pray for healing, both physical and emotional, and for the protection of her and her children. We ask that You grant her the wisdom and courage to set boundaries and make decisions that honor You. We pray for salvation for both of them if they have not already accepted Jesus as their Lord and Savior.
Lord, we ask that Your truth be revealed. Your truth will set us free. If this is not a godly relationship, we pray that she would have the strength to leave this relationship. In Jesus' name, we pray. Amen.
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. 
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