Question. Please help.

So my husband and I are thinking of acting on some fantasies of his. He really wants to watch me with another woman. When he first told me this I was very excited. I  am attracted to other women, and he said he doesn't want to join ...so I get to have all the fun. (Wink wink) however, the more I think about it the more insecure I feel. It makes me feel like he's not happy enough with me and needs to see other women. Also how will this play out in the future? Will it make him bored with me and to where he's constantly fantasizing about the other woman he got to see naked? I hate to sound like a baby to such experienced swingers but I can't help my concerns. Any input is respected and appreciated. TIA