What is the ruling of the Shari'a on a young man helping his ex-fiancée, who is now married to another man, and who complains to him that she does not love her husband and asks for his help?

Establishing an emotional relationship with a foreign woman outside the framework of marriage is forbidden, and one must repent from it. Conversing with a foreign woman to reconcile her with her husband is permissible when there is a need and no fear of temptation, though avoiding the conversation is preferable. We advise that someone else undertake the task of reconciliation to avoid falling into what is forbidden, especially since you had a relationship with her and she is still attached to you.