Is it permissible to continue clinging to the hope of returning to someone who broke off the engagement after years of attachment and a long relationship, and how can one overcome this difficult stage?

You must be content with the decree of Allah the Almighty, for what has befallen you may be good for you. supplicate to Allah to grant you a righteous husband. The treatment for infatuation is possible, and you must repent from establishing forbidden relationships with non-mahram (definition) men. The knowledge of the family does not change the ruling of the prohibition of such a relationship. Engagement is merely a promise and can be broken; its prolonged duration may cause problems. We have no knowledge regarding the interpretation of what is seen in dreams. As for the evil eye and magic, these are possible, and ruqyah (definition) (Islamic incantation) is a cure for them. However, beware of excessive delusions and whisperings (waswasah). Occupy your time with what benefits you and associate with righteous women.