How can I get back my ex? He cheated, but I made so many mistakes and pushed him away. What do I do now?

Conversation is only the key for the best relationships, you should talk to him politely and tell clearly whatever you think about him, tell him about your mistakes and you will recover that mistakes. And just be open by mind

why would you want to get back with him? He hurted you, betrayed you, don't you deserve better? You may have pushed hiim away but that doesn't justify that fact that he cheated on you, so do you really want to get back with him? If you even after all this maybe you should talk to him but honestly I think you should think about it, remember how he made you feel and think if you want that person back in your life. That's all I have to say, just try not to get hurt because he cheated once