It's called fear.
You clearly don't understand how domestic violence affects victims, or how perpetrators operate.
http://www.sussex.police.uk/advice/protect-yourself-and-others/domestic-abuse/
https://www.victimsupport.org.uk/crime-info/types-crime/domestic-abuse?gclid=CJPQ-Y3nu88CFfMW0wodETIOtA