What is the expiation for acquaintanceship and love before marriage, while adhering to the Sharia's guidelines? And does that affect success in marriage?

Forbidden love before marriage is a relationship that includes unlawful matters such as looking, touching, and being alone together. It is forbidden because it encompasses these prohibited acts. However, if love occurs without a person's choice and is not followed by anything forbidden, there is no blame. Whoever has committed a mistake in this regard must repent and seek forgiveness. It cannot be definitively stated that someone who loved before marriage will not be successful, as this is a matter of the unseen. Nevertheless, forbidden love can be a reason for lack of success. For one who repents and turns to Allah, success is hoped for, and evil deeds may be replaced with good ones.