Husband wants me to have sex with another man

For the past few years my husband has been expressing to me that he wants to watch me have sex with another man. This is something I've told him repeatedly that I'm uncomfortable with and have no desire to do. Yet he continues to ask me to do it. Lately, he has become more persistent about it and even has withheld sex because i won't sleep with another man. It has gotten to the point that I feel like it's ruining our sex life. I don't know what to do. I'm afraid if I do it that it will ruin our marriage and make me resent him because I feel like I'm being forced into something I don't want to do. Any advice would be greatly appreciated. Thank you.

Yes he wants to watch. It's a fetish and I guess it's not that uncommon. But I'm really bothered by how persistent he is about it. I feel like he doesn't respect the fact that I have no interest in sleeping with another man.

Don't! Tell him if he doesn't respect you, You respect yourself. Tell him if he doesn't know you, You know yourself and what you want and will or will not do. Tell him this could ruin your relationship because he is so out of touch with You! How long married? And if it keeps going on, You will have some hard decisions to make!