Is it normal to hate your mother?

I have hated my mother since I was 13 years old. Im 20 now and nothing has changed. I've hated her since I found out that my parents were getting divorced, and the reason was she was having many affairs. I didn't immediately start hating her at that moment , but I knew that I could never look at her the same. What finally pushed me over the edge to fully hating every fiber of her being was when she was dating this hellion. From the moment I met him I knew he wasn't a good person. He always seemed to be shady and his mannerisms just plain pissed me off. Ever since she first started dating this "man" her attitudes changed towards me for the worst. I started telling her how I felt about him, and ever since then she is always rude to me and is never willing to help me with anything. We get in many fights about useless things and she is just a plain bitch to me even when things are going smoothly.
After a few years of dating him, my mother started seeing a new man. He the nicest person I had ever met and very genuine. After a year of dating him they got married and everything seemed to be great. Then one night I heard my mother talking on the phone to that hellion again. I was pissed. How could she do this again? Well not long after that he found out and moved out but he still keeps in contact with me and my brothers because he is truly the nicest guy. And my mother went back to the the one and only hellion, and they have been seeing each other ever since.
Recently I found that he had been cheating on my mother. Honestly I never felt bad because thats what she did to my father and ex stepdad and karma's a bitch. She's still with him to this day and forgives him every time he cheats. Can you say doormat, because I can. We barely talk anymore and she has no interest in me and vice versa. She is the worst mother and sociopath that has no conscience, truly.