You are being blamed for someone else’s failings and mistakes because they refuse to accept responsibility.
Emotional manipulators will always justify with an external reason for their adversity and misfortune. They need to pull others down to share their misery or make themselves look superior and will do anything to avoid being the one at fault.
It’s difficult to tell a habitual blame shifter that they are to blame because they get defensive and feel victimized. They seem to always have a back story that attaches blame to the people around them, their past, or their circumstances. Avoid engaging in this type of behavior and distance yourself from their drama.