Ruling on one who apostatises repeatedly

He took some money from a girl with whom he had a relationship; does he have to give it back?

He has repented from dealing with a riba-based bank but he does not know what his capital was

Will I Be Punished Even If I Repent from Zina?

Repent before It Is Too Late: A Call to Reflect

Fighting Temptations on TV and the Internet

He is afraid that if he returns money that he stole before he was guided, he will be found out. What should he do?

What are lamam (“small faults”)? And what is the ruling on a disobedient Muslim who repeatedly commits them?

He caused some harm to his friends; does he have to tell them if he intends to repent?

Ruling on using cameras after repenting