The long-lost room mate.

I've only shared a flat once.  I'd recently moved out of the family home to live in East London.  Girlfriend #1 and I had been joined by someone to share the costs (which, as I recall, were HUGE).  His name would remain anonymous, but since it's lost the to the mists of time that's dealt with.   He was - as I recall - a massive, inconsiderate tools.  Lost yet, but missed?  Not in the slightest.