Break ups really hurt and there is no getting around that, but if the Lord has told her that He doesn’t think he is right for her then I think she should break up with him. You can think of dating as practice for marriage. But it doesn’t mean that the Lord wants you to stay with him, especially if he isn’t living for Jesus. God may lead you to someone else, but it is best to forgive and try to work things out unless through careful, humble prayer God has led you to leave the relationship. I think that is what has happened here.
Maybe this is happening so that he can have the chance to have a meaningful relationship with Jesus Christ apart from her. It is better that he have the influence of the Holy Spirit in his life so that he can have a closer walk with Jesus. What a comfort to know that God “will never leave you nor forsake you” (Hebrews 13:5). God is always near to comfort the believer. “Blessed be the God and Father of our Lord Jesus Christ, the Father of mercies and God of all comfort, who comforts us in all our affliction” (2 Corinthians 1:3-4). God, who cannot lie, has promised to go through our trials with us. “When you pass through the waters, I will be with you; and through the rivers, they shall not overwhelm you; when you walk through fire you shall not be burned, and the flame shall not consume you” (Isaiah 43:2).
God never failed one of His people when they cried out to Him, and He will not fail the heartbroken Christian who cries out to Him today. He may not always answer exactly in the way we would like, but He answers according to His perfect will and timing and, while we are waiting for the answer, His grace is sufficient (2 Corinthians 12:9).
Finally, those who belong to Christ and are enduring heartbreak must know that God loves them and that His love is unconditional. Imagine the grief God the Father endured as He witnessed the crucifixion of His Son on the cross. What amazing love! That same God is there to comfort the brokenhearted and restore the joy of their salvation. God bless you!!! :):)