If he left you for another woman why do you want him back? Men know what they want immediately. Did you pray with someone who has discernment to discover if he's the one God has chosen for you?
Heavenly Father, I praise you for knowing who you've chosen as a husband for this young woman. The man who loves, protects, prays for and honors her. Please give her confirmation about this guy & if he's not right for her, remove her feelings for him immediately. If he's not the one for her, move him out of the city where she is completely so she has no doubt. Draw her to the man you've chosen & bless her to know that a deep level of respect for him that she has for no other man she's met is what points that he's her man, hand picked by you. I praise you because you faithfully answer prayers. Give her a deep desire to study 2 Peter, Deuteronomy & Ephesians 5 so knows how to be a godly wife who respects, honors, serves and supports her husband's vision. In Jesus' Name. Amen