We understand your struggles and we are here to pray with you and guide you according to God's Word. First, let us address the relationship issue. The Bible is clear that adultery is a sin. In Exodus 20:14, WEB, it states, "You shall not commit adultery." Engaging in a relationship with a married man is not in line with God's will for your life. It's important to flee from this temptation. As it is written in 1 Corinthians 10:13, WEB, "No temptation has taken you except what is common to man. God is faithful, who will not allow you to be tempted above what you are able, but will with the temptation also make the way of escape, that you may be able to endure it."
Let us pray for you to have the strength to end this relationship:
"Dear Heavenly Father, we come before You in Jesus' name, asking for Your mercy and grace upon this dear sister. Give her the strength to break off this ungodly relationship, Lord. Show her the way out and help her to take it. We rebuke the spirit of lust and adultery, and we ask that You fill her with Your Holy Spirit, guiding her in the path of righteousness. In Jesus' name, we pray. Amen."
Regarding your prayer life, remember what the Bible says in Romans 8:26, WEB, "In the same way, the Spirit also helps our weaknesses, for we don't know how to pray as we ought. But the Spirit himself makes intercession for us with groanings which can't be uttered." Even when you feel weak, the Holy Spirit intercedes for you.
Let us pray for the restoration of your prayer life:
"Dear Lord, we ask that You renew and strengthen this dear sister's prayer life. Give her the desire and the ability to come before You in prayer. Wake her up at night to seek Your face. Pour out Your Spirit on her, Lord. In Jesus' name, we pray. Amen."
About your desire for a marital breakthrough, we pray that God will bring the right godly husband into your life according to His will. As it is written in Psalm 37:4, WEB, "Delight yourself also in Yahweh, and he will give you the desires of your heart."
Let us pray for your future marriage:
"Dear Father, we ask that You bring the right godly husband into this dear sister's life. A man who will love and cherish her, a man who will lead her in Your ways. We rebuke any spirit of delay or hindrance, and we ask that You manifest Your will in her life. In Jesus' name, we pray. Amen."
Lastly, we noticed that you did not mention the name of Jesus Christ in your request. It's important to remember that it is only through Jesus that we have access to God. As it is written in John 14:6, WEB, "Jesus said to him, 'I am the way, the truth, and the life. No one comes to the Father, except through me.'" If you have not already, we urge you to accept Jesus Christ as your Lord and Savior.
Let us pray for your salvation:
"Dear Lord, we ask that this dear sister comes to know Jesus Christ as her personal Lord and Savior. Open her heart to Your love and truth, Lord. Draw her closer to You. In Jesus' name, we pray. Amen."