We are truly concerned for your well-being and want to address the issues you've raised with biblical wisdom and compassion. Firstly, let's address the feelings of jealousy, insecurity, and even suicidal thoughts that have arisen due to the situation with this girl. The Bible tells us, "For God has not given us a spirit of fear, but of power, love, and self-control" (2 Timothy 1:7, WEB). Suicidal thoughts are not from God, and there is always hope and a way forward in Him.
However, we must also address the root cause. The Bible is clear about the sanctity of relationships and the path to marriage. It's important to note that dating should ideally be courtship with the goal of finding a godly spouse. The situation you're describing, where the girl is looking to date other guys, does not align with biblical principles. In fact, the Bible warns against immoral behavior and the lust of the eyes (1 John 2:16, WEB).
In regards to your feelings, the Bible advises, "Let all bitterness, wrath, anger, outcry, and slander, be put away from you, with all malice. And be kind to one another, tenderhearted, forgiving one another, even as God also in Christ forgave you" (Ephesians 4:31-32, WEB). It's crucial to forgive and let go of any bitterness, while also setting boundaries to protect your emotional and spiritual well-being.
Let's pray together:
"Dear Heavenly Father, we come before You in Jesus' name, lifting up our brother who is hurting deeply. Lord, please comfort him and fill him with Your peace and love. Help him to cast all his anxieties on You, knowing that You care for him (1 Peter 5:7, WEB). Guide him to make wise decisions in his relationships, and if it is Your will, lead him to a godly spouse. Help him to forgive and to let go of any bitterness. most importantly, Lord, restore his hope and give him the strength to overcome any suicidal thoughts. We claim Your promise that You have plans to give him a hope and a future (Jeremiah 29:11, WEB). In Jesus' name, we pray, Amen."
Lastly, we strongly encourage you to reach out to local Christian counselors or pastors to get personal and professional help to navigate through these feelings and circumstances. You are not alone, and there is always hope in Jesus Christ. If you haven't already, please consider committing your life to Him and trusting in His love and plan for you.