Am I overreacting here?

You signed a lease WITH the friend and not the boyfriend... IT is RUDE of them to not leave you shelf space and it has imposed on your lifestyle. Let your friend know that you are not upset to let the guy crash for a few days but that taking up all fridge space is inconsiderate and you want your shelf or a separate fridge. ALSO Ask her if she has notified landlord yet. I think its kind of rude for a friend to invite a male into women territory.. heck he's not YOUR boyfriend.. ask her if situatino was reversed woudl she be keen on splitting rent while lifestyle is invaded?