A roommate has sparked online debate after letting a friend stay without informing another party.

A shared home becomes a source of tension after one roommate invites a friend to stay for two months without consulting the person who also pays the rent.

Living with a roommate often means learning to compromise.

You have to negotiate everything from cleaning schedules and grocery shopping to overnight guests and how much space everyone gets in the fridge.

But one Reddit user is questioning whether their roommate crossed a line after allowing a friend to effectively move into their home without asking first.