I'm thinking of quitting my job and leaving my boss to work by himself
Are you having problems with your boss?
Yes, he is a parasite who draws on my labor more than I am paid for.
When you are having troubles with your boss and there is no way to fix the problem, it is okay to leave the job. You don't need the headache and can find a job where you don't have problems.
I'm going to leave, he will get desperate soon enough and start begging to me to come back. I need to show my boss that he needs me.
It is ok to quit your job if it isn't working out. If you do plan to return later you should not expect the dynamics to change from how they were.