How can love turn so evil?

I cant tell you Wat evil love maybe or domestic violence i can only tell you Wat it feels like.I seen it heard friends stories seen family destroy their relationships with physical abuse how sad. Domestic violence is a pattern behavior a man or women in which uses physical violence,threats,intimidation,emotional,economic abuse,control over partner,stalking,harassing.I will never understand how can someone say they love a person and yet hurt them its insane.Its crazy how a women or man can stay in a abusive relationship why do they stay I can honestly say because when you love someone with all your might and power then you try to put your whole heart and soul into making it work between you, hoping you will come out in the end together strong and happy. But in most cases no, it don't work, but  thankfully people manage  and no longer suffer at the hands of their abuser.Its like the Rhianna song just gonna stand there and watch me burn but that's alright because i love the way it hurts just gonna stand there and hear me cry but that's alright because i love the way you lie.I would like to say once he or she acts strange  start with sarcastic comments, silly little name calling , telling you no other person will  loved you or like you, telling you your family and which friends I had left all don't like you. Then you Will have no self confidence and  struggle to have any because when someone tells you you are ugly or stupid every day of your life it is hard to find that you are no other than that.Please leave before its to late and you may end up dead if they abuse you once its mostly certain that they'll do it again and again at times you will think wow they are  changing its going great and then they snap at any little thing  and its the same story repeating you eventually loose count of how many times you got hit. One thing i know their is no excuse for anyone to hurt a person not even if they are traumatized of their childhood past or they seen their parents fight allot ect... their is no excuse!!For all people who have gone through this kind of situation just want to say your a survivor you have strength believe in your self that you have the strength to move forward with your life you want to get in a stage where your past does not affect your everyday life you have choices don't blame yourself of the choice you made in the past praise yourself value yourself take any guilt off your shoulders start to achieve Wat you wanted to achieve in life move towards happiness.change that bad memory in your past in to hope for your feature.