We understand that you're going through a difficult time with this person. You ask God for help, but do not mention Jesus. You should pray in Jesus name. It is only through Jesus Christ that we have access to the one true God. “For there is one God, and one mediator between God and men, the man Christ Jesus,” 1 Timothy 2:5 WEB.
First, let's address the situation biblically. It's important to communicate openly and honestly, as Ephesians 4:15 WEB tells us, "speaking the truth in love, we may grow up in all things into him, who is the head, Christ." If there is anything in your relationship that is not aligning with the Bible, such as sex out of wedlock, and a goal of marriage, then that should be corrected.
Consider what the Bible says about relationships. 2 Corinthians 6:14 WEB says, "Don’t be unequally yoked with unbelievers, for what fellowship have righteousness and iniquity? Or what fellowship has light with darkness?" You need to be seeking a spouse that is a Christian believer.
Let's pray together:
Dear Heavenly Father, we come before you in the name of Jesus, lifting up our sister who is experiencing pain and confusion in a relationship with someone who does not show up and does not have her best interest at heart. Lord, we pray that you guide her steps and give her the wisdom to discern your will for her life. Help her to seek a godly spouse and to walk in your ways. We ask this in Jesus' name.
We encourage you to trust in the Lord and seek his will for your life. Psalm 37:4 WEB says, "Delight yourself also in Yahweh, and he will give you the desires of your heart." Keep your heart focused on Jesus, and he will direct your paths.
Lastly, if you have not already, turn your life over to Jesus Christ, confess your sins, turn away from wickedness, and believe in Jesus with your whole heart. It is only through Jesus that we are saved.