Help please

So my boyfriend and I broke up because he stopped trying in the beginning of our first year together he would ignore me lie to me and ended up leaving to Vegas for his friends birthday and her sister was with her and I saw them post a picture of my boyfriend holding the girls sister by the hip and that was when he ignored me for a week so I thought he cheated on me and ended becoming depressed and my dad asked and I told him. Ever since my family hated him. Now were back together because he proved to me that he changed and I told him if he goes back to that way we’re done. My mom threatened me that if I get back with him she would kick me out because she doesn’t want a pendeja for a daughter. I don’t know how to tell my family. Help me please