Possibly. However it is your house and you call the shots. If you don't want the b/f to stay over (and 4 nights per week does start to look as though he is living there), you are perfectly within your rights to ban him altogether. If your lodger doesn't like it, tough. TBH, unless the boyfriend is paying you for the electricity he uses and gas and the general extra wear and tear he causes, I would say you are being taken for a bit of a mug. Your lodger is a guest in your home and is abusing her position, in my view.
Originally Posted by Pureedfruit
Do you have a written contract with her - and if so, does it say anything about overnight visitors?
'Pause you who read this, and think for a moment of the long chain of iron or gold, of thorns or flowers, that would never have bound you, but for the formation fo the first link on one memorable day'. Charles Dickens, Great Expectations