Struggling a bit today

Last night my wife said (again) how happy she was that I have previous experience with guys. I told her “me too” and then I told her that, to be honest, I still think about how awesome it would be to do that again someday. We’ve been 100% honest since I came out to her and really don’t want to slip back into hiding feelings. She admitted that hurt a bit… because she doesn’t ever think about what it would be like to be with anyone but me. I told her how she’s all I need. The only person for me to spend forever with and she came back with yes… but “I’m not all you want”. Ouch…. I really didn’t know what to say. I do have fantasies about bringing a guy into the picture so yes… I guess i do want that. But I don’t want it if she doesn’t want it. I don’t know…. She says it’s okay. That all guys want a threesome (they don’t all want a mmf threesome of course but same diff). Then in the next breath she wishes that she was enough. That she was all I want. It kills me that I’m hurting her. But I also don’t want to lie about it either. This conversation has happened …. Identically…. 3 or 4 times since I came out to her. 90% of the time she is amazingly supportive but every once in a while we have this. Just not sure what to do… if there’s anything to do.