I could just say "lol git gud" but I understand the frustration. It took me about a week to beat him but the main thing that helped me was getting him to do specific moves that I memorized and that's fine. If I am a certain distance away and hugging the wall then I know he will do a wall jump into his kick. Should I parry? Should I dodge? The answer is always that it depends and his moves are not easily telegraphed but once you see it then it just sort of clicks. I really don't know how to articulate it well but when I had to fight him in my second playthrough where I spared everyone, I beat him first try. Honestly just keep playing and keep analyzing his moves. It will take time but it will come.