I live in an apartment in idaho. my boyfriend moved in with me but wasnt put on the lease.?

... i ended up trying to add him to the lease but the landlord denied it because he has a felony. and said hes not allowed to stay anymore night cause he already stayed two weeks this year.. can she give me an eviction notice if he stays the night again? i found out she just let another guy and his girlfriend move in and he has several felonies and is on parole. is this faair??????