Hurt/Need advice

I met my husband only a little over a year ago..I wasn't ready to get married but I felt a lot of pressure from my family. I found out right before the wedding that he cheated on me with his ex. She says it happened several times..he says once. I'm not sure what to believe seeing how he lied about it for so long. My heart just doesn't believe him. Since we have been married he just treats me terrible!! We argue every single day..scream curse.. And he doesn't trust me! There is no reason to not trust me. I just feel like I can't take the mental abuse anymore. I don't deserve it. I wanna leave...