Why had Rafael come back?

In the five years since their marriage ended, Sarah had devoted herself to her beloved twins. She’d never expected Rafael to walk back into her life, nor had she realized he’d been unaware of the twin’s existence. Theirs had been a whirlwind courtship. Rafael loved with passion; he created hauntingly beautiful works of art with passion; and Sarah realized now on a tide of pain and regret, he hated with that same emotional intensity. Rafael hadn’t changed – he was still a determined, dangerous man. But with the wounds of the past unhealed within her, Sarah wasn’t going to get burned again! (copied from lynnegraham.com)