@au_gold You need to man up/grow a pair and dump her whore ass, do not put up with a girl who is fucking other men and likes to demean and disrespect you like that.
If it was an open relationship it would still be messed up but you would be able to nail other women, what your describing is her treating you like a bitch and that is not right.
Kick this bitch to the curb and find a woman who will treat you as an equal/give you the proper respect.