You seem to have given up on the second job where you are facing mistreatment at work. If you simply do not show up, you will be discharged (fired) after three days of no call/no show typically and that won't be good for your employment record. You'll have a blemish on your work record on top of the mistreatment. Instead, start looking for a new second job ASAP and give your resignation when you're ready. Depending on the nature and severity of the mistreatment you have endured, consider complaining to HR about the supervisor's behavior before you leave.