I committed serious sexual sins with my girlfriend over the last 4 years. We broke up recently. I want to truly and deeply repent for my sexual sins. How can I be washed clean because my sins are great? I hear a call to repentance. Will God restore my broken relationship? It is my heart's desire from the beginning to marry her. We had plans for the future -- plans that will glorify the Lord. Our relationship was a purposeful one. It was not infatuation, but we fell into sins.
How shall I pray to God for repentance? How shall I pray to God for restoration?
One reason sex is limited by God's command to only the married is because of the problem you experienced. Intentions are not reality. You excused your sins by telling yourself that you would eventually marry your girlfriend. But no one knows the future.
Repentance is changing your mind about your sins -- realizing that they were not acceptable to God. It is also changing your actions -- you stop committing sins. These are things that you do. God does give repentance. God gives forgiveness when a person starts following Him and one of the things required is giving up your sins (repentance). See How to Become a Christian. Even if you think of yourself as a Christian, read the passages cited in the article because most people have only done a part of what God requires of them.
God doesn't hear the prayers of sinners. He doesn't support sin. Thus, to restore a relationship where you were defying God by committing fornication does not make sense. You don't glorify God by ignoring God's commands. As Paul stated, "... they will glorify God for your obedience to your confession of the gospel of Christ ..." (II Corinthians 9:13).
Change your life. Stop claiming to be Christian while living the life of a heathen. Submit your life, your thoughts, and your actions to God and He will raise you up. "Submit therefore to God. Resist the devil and he will flee from you. Draw near to God and He will draw near to you. Cleanse your hands, you sinners; and purify your hearts, you double-minded. Be miserable and mourn and weep; let your laughter be turned into mourning and your joy to gloom. Humble yourselves in the presence of the Lord, and He will exalt you" (James 4:7-10).
Thank you for the answer, preacher. I have repented from my sin. I am praying to God to renew our relationship into a Christ-centered one with my ex-girlfriend. I have faith that God will restore our relationship because He sees my heart.