We are truly saddened to hear about the pain you've caused and the regret you're experiencing. Firstly, it's commendable that you're taking responsibility for your actions and wanting the best for the person you've hurt. However, we need to address several things in your request.
It's important to remember that God wants us to bring our petitions to Him in Jesus' name. It's only through Jesus that we have access to God, as it's 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." Also, there is no other name by which we can be saved. See Acts 4:10-12. Therefore, we pray that you would come to a saving faith in Jesus Christ.
Now, let's address the situation. When we've wronged someone, our first responsibility is to seek their forgiveness, not necessarily to expect a romantic relationship with them. In Matthew 5 23-24 WEB, Jesus says, "If therefore you are offering your gift at the altar, and there remember that your brother has anything against you, leave your gift there before the altar, and go your way. First be reconciled to your brother, and then come and offer your gift."
It's also crucial to understand that our happiness should not depend on another person. God can turn your mourning into dancing and give you a hope and purpose. It is written in Psalm 30:11-12 WEB: "You have turned my mourning into dancing for me. You have removed my sackcloth, and clothed me with gladness, To the end that my heart may sing praise to you, and not be silent. Lord my God, I will give thanks to you forever!" Besides your personal issues, God can sustain you, healing your heart and preparing you. When and if you marry, you should both be Christians seeking to Glorify God in your relationship.
Moreover, wishing to "end up your life only in the arms of that person" can be interpreted as idolatry and making a marriage an idol, putting it before the plan that GOD has for you. Be careful that this does not happen. GOD needs to be your everything and pleasure. Otherwise, you will never be content. This is part of the problem. See Exodus 20:3-5.
Lastly, it's important to note that God's will is for us to live, even if we've made mistakes. If you're feeling suicidal, please reach out to a mental health professional immediately. God has a purpose for you, and He wants you to live and serve Him. See John 10:10.
Let's pray together in Jesus Christ's name.
Heavenly Father, we come before You, lifting up this person in prayer. Lord, they've made mistakes and are feeling the weight of their actions. We pray for Your forgiveness and healing in their life. Guide them to seek forgiveness from the person they've hurt and help them to find their worth and purpose in You, not in another person. We pray for the restoration of their relationship or marriage, expectantly looking to honor yourself in the relationship and in accordance with your will in Jesus' name we ask this. Help them to overcome these feelings of regret and suicide, and give them a vision for the future You have for them. Turn their mourning into dancing, their sorrow into happiness. Draw them closer to You, Lord. Lead them to the saving faith in Jesus Christ, and give them your comfort. Surround them with Your love and peace, and help them to live a life that serves You as You will. We pray and ask all of this through the power in the name of Jesus Christ the son of the living God who lives and reigns with you in unity with the Holy Spirit, one God world without end."
Hadar:
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**Prayer Updates!** 
Let's lift up @Tyroumore's children, Tom & Karyn, for healing!
Praying for @Roshan Dsouza's financial debt relief.
@Osvelis needs prayers for loneliness & new connections.
@Alexander Yondel & @Powers request protection & strength.
Let's believe for @Thruothor's financial breakthrough!
Amen
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