What should someone do who committed fornication with a virgin girl and repented, but cannot marry her, and consequently feels remorse and psychological pain?

If a person repents with sincere repentance, fulfilling the five conditions (remorse, cessation, determination not to return [to the sin], sincerity, and that the repentance be before it is too late), then Allah will expunge all their past sins, even fornication. The Quranic verses mention that whoever commits polytheism, murder, or fornication will face retribution, "except for those who repent and believe and do righteous deeds. For them Allah will change their evil deeds into good ones." As for the woman who was fornicated with, if she was willing, she is accountable for her action; if she was coerced, then the coercer must repent and seek her forgiveness or increase supplications for her. Regarding the loss of her virginity, if the repentance from both parties is sincere, it is hoped that Allah will grant them a way out and relief. And Allah accepts repentance from His servants and pardons sins.