Dear LIB readers: At what point should a woman walk away?

This is Mercy Nnamdi, the woman whose husband killed their son and burnt her with hot iron

A LIB reader sent this in as a comment and wanted me to share with the rest of you...

I have been married for just two years with a 14 months old baby. About seven months after I got married my husband slapped me for coming home late. I was pregnant at the time. He slapped me again in December 2011 because of a statement I made to him. Then just last week he slapped me for the third time during an argument. He hasn't been very violent but I'm afraid it will happen one day. Should I be worried? Should I divorce him because he slapped me?