How to get over betrayal ?

He had his slut who was married to someone else and cheating with him and gave birth to his kid and he seems so proud of that bad deed... I just don't know how to get over this feeling of getting betrayed I was 14 years younger than him and now tht I think abt it he was jst using me for his fun he never took me seroiously n everything he wud tell me abt every song movie wud relate to him n her he led me on n told me abt tht kid n still wanted me to support him everytime I wud tell him I won't talk to him he wud jst agree that was before I evn knew hiis evil life I hate liers n betrayals n the fact tht he took me as a nobody makes my mind go crazy and it hurts everyday?