I live with my DP, we both pay for rent and bills, not long ago a new flatmate moved in( so just 3 of us in a 2 bed flat ) and he met a girl who all of a sudden is always here, stays 4/5 nights a week, is rude, noisy, often having loud arguments and both are not at all respectful of other people living here. AIBU to be annoyed about this? she doesn’t pay any rent but has stayed here for about 70% of the time he’s lived here. when i brought it up was told she is here as a guest and she shouldn’t pay rent and there’s no problem with it. 