My abusive relationship

She was 15 almost 16 when she first met Matthew. He was 26 when they met. And he loved her instantly but she wasn't sure how she felt until he slapped her across the face for the first time.
She ended it but didn't tell anyone because he made her forgive him and she went right back to him.
For multiple years she did the same thing until one boy came along. But before that she got a surprise.
What would happen to her? What kind of surprise would she get? Who is the boy she would meet?