friend issues

there has been some drama going on between me and one of my friends mostly its past issues that we both keep bringing up. anyway I'm not gonna tell the story cuz its too long but how did anyone deal with a friend loss or drama. or blaming you for a lot and not really seeing their side not that there is meant to be sides but she has made me feel like I am such a bad human and I am not & I know this but it does make you feel bad.