PRETORIA, South Africa (AP) — Oscar Pistorius and Reeva Steenkamp argued fiercely in the turbulent weeks before he killed her, and the athlete’s girlfriend told him she was sometimes scared by his behavior, which included jealous outbursts in front of other people, according to phone messages revealed at the Olympian’s murder trial on Monday.

“I’m scared of u sometimes and how u snap at me and of how u will react to me,” Reeva Steenkamp texted Pistorius, in a message read out in court by police Capt. Francois Moller.