Ajeeb Daastaan Hai Ye S03 E02 Vikram's Troubled Past

Shobha notices that Vikram is upset after she asked about his past. Ridhima confronts Tarun as he badmouths Shobha. Later, Vikram gets furious at Jiya and Rehaan for looking into his personal diary. What happened to Vikram that troubles him to this day?