Years ago I was told the easiest way to lose a good friend is to move in with them. It's absolutely true.

I had a very good friend that convinced me to abandon my comfortable one bedroom and co-lease a two bedroom. "We'll split expenses that way!" One month later he wasn't paying the half of rent, and buying food was a joke. At the end of the month he would approach with "I'm giving you $300" which wasn't close to even half the rent. He was spending over half in income on pot and even a lot of that was financed through payday loans. He wouldn't do even the most basic household chores like taking the trash out or washing dishes he soiled although he was home all day and I worked 6 days a week.

I had to kick him out. "Two can't live cheaper than one" isn't true, unless they both contribute.