Going by your name/supposed location, they'll tell you to chuck your boyfriend out and get used to sleeping with the bedroom door open, chuck him out and get a single bed - or to move into the living room.
You'd get a place in a B&B halfway across the country if your Mum threw you out and your boyfriend left you, though.
Back in the 90s, my 2 bed (and tiny) council flat had a permitted number of five unrelated adults sharing before it was regarded as being overcrowded. It would have been reassessed as having three rooms to sleep in now.