Is a suitor's withdrawal from an engagement considered a result of Istikhara or a punishment for the fiancée giving him her phone number without her guardian's knowledge?

If a servant of God performs Istikhara (seeking guidance from God) and his heart is content and his chest is open to a matter, then he must take the permissible means. A woman's conversation with a man for a need, within the Shariah-compliant controls, is permissible. The young man's withdrawal from you might be a result of Istikhara, so be content with what Allah has chosen for you. Do not hesitate to accept a young man of good character and religious commitment. It is not from the Sunnah to delay a girl's marriage if a suitable suitor is found.