jessica silva stabbed james polkinghorne outside her home in 2012 .
ms silva was physically and mentally abused by polkinghorne .
she claims that if she had not acted first she would have been killed .
silva has sought forgiveness from his father and has reunited with him .
while he ca n't understand why she killed his son he said he has ` no anger '
jessica was found guilty of manslaughter but had her sentence suspended .