I like to fantasy with other than my husband

My husband always talking that he would like to watch me having sex with other men. now i too, fantasying other men especially my ex-boyfriends with whom i had sex during teenage. one of ex-boyfriend is also my husband's best friend. He even used to visit when my husband is absent from home. He even teased me, pat me. I feel like embracing him as my memory is still alive, how we were making love in my room when my old mother was out of home. He too, got married to a girl. Yet, he used crack a joke that I was the only women who could satisfy his hunger for sex. My husband even insist me to have sex with this guy who is also his own friend and my ex-boyfriend too. I had never confessed to my husband about my affairs, but i think they must have known each other better than me.