Do you think what she has done is right?

my boyfriend and i have been dating for 2 years both living at home but doing the sleep over thing.. after 2 years of dating and staying at my boyfriends house his mum (after a fight between them, i wasn't involved) then decides that i am not allowed to stay over more then one night a week and after him questioning why shes doing this. she said she made this rule because we couldn't follow her rules of doing the dishes. (which we did the morning afternoon and night dishes more then her) and that we have all the perks or living together and none of the responsibility when we were doing everything for ourselves and even baby sitting her child while she was out for the night or busy. she has also banned me from staying for dinner unless its the night im staying over and i have to leave before 4 or she gets angry because ive been there to long. clearly this isn't over dirty dishes or not having enough responsibility why do you think she would be doing this and just all of a sudden? after 2 years?