Is preserving oneself from forbidden relationships proof that God will provide a girl with a chaste husband who has no previous experiences, or is the rule that God will provide a man who fears God now, even if he has sinned previously?

It is obligatory for a Muslim to do what Allah has commanded and to abstain from what He has forbidden. If one commits a sin, they must hasten to repent and seek forgiveness. Whoever repents with sincere repentance, Allah will forgive their sin and erase it, making it as if they never committed it. The servant's state after repentance may even be better than their state before the sin. So, if a girl or a young man repents from sins, what matters is their condition after repentance and their adherence to righteousness, and they will not be held accountable for what preceded it. Allah does not wrong His servants, and everything He decrees for the believer is good for them. Therefore, a Muslim must adhere to Allah's law, be content with His decree, and strive in supplication for Allah to grant them success and bestow upon them from His bounty.