Starting a business isn't therapy, it was never going to be anything other than hard work - particularly in retail. The issue you have right now is that walking out on your business partner and leaving them with another 8hrs a day to pick up is likely to mark the end of the friendship, not just the business partnership. >*If I continue, my share might only make around $100–$150 a month later on, which isn’t much compared to the mental cost.* $150/month for 8hr days was never a valid business plan to begin with. Unless you're about to reveal this business is somewhere you can live on $1/day.