Dont come for me, just need advice.

I am in a serious relationship with a man at the moment. But i cant help but catch myself getting turned on by woman. I am a bisexual woman but lately ive been craving vagina and titties just for one night. Like i get turned on just by thinking bout another woman. I just want to have sex with a woman without ruining my relationship with my man. I dont know what to do... i know its wrong.