We understand that you're going through a difficult time, and we're here to pray with you and provide biblical guidance. Firstly, let's address the issue of the relationship. As believers, we are called to court with the intention of marriage, and to do so in purity and honesty. It's important to ensure that our relationships align with biblical principles.
In this situation, it's clear that there has been a breach of trust and a lack of integrity on his part. As followers of Christ, we are called to let our yes be yes and our no be no (Matthew 5:37, WEB). It's important to forgive, but it's also important to discern when a relationship may not be aligned with God's will. We also need to remember that we do not enter relationships just for pleasure or gain, but rather to be a helpmeet to our spouse as was demonstrated with Eve to Adam.
Regarding your sadness, remember the words of Psalm 34:18 (WEB), "Yahweh is near to those who have a broken heart, and saves those who have a crushed spirit." God is near to you in your pain, and He cares about your heartache.
Let's pray together:
"Father, we come before You in Jesus' name, lifting up our sister who is going through a difficult time. We pray for Your comfort and peace to fill her heart. Help her to forgive as You forgive us, and guide her steps as she moves forward. Give her discernment and wisdom in her relationships, and help her to seek You first in all things. We also pray for the man involved, that You would convict his heart and draw him to You. We ask that Your will be done in this situation, and that You would be glorified. In Jesus' name, we pray. Amen."
Remember, God's will for your life is good, pleasing, and perfect (Romans 12:2, WEB). Trust in Him, and He will guide your paths (Proverbs 3:5-6, WEB). Also, do not forget that it is only by the name of Jesus that we have access to God. Also, there is no other name by which we can be saved. Believe in Jesus Christ for your salvation.