Normal? Not normal?

So, the idea of a threesome turns me on. My husband could take it or leave it, but would definitely be willing if I wanted to. We bring it up during sex because it turns me on so much. However, when I actually think about doing it, and consider the aftermath, I get incredibly jealous and I know that I’m not ready and probably never will be. But I can’t get over how turned on the idea of it gets me.

Sometimes I get turned on thinking about catching my husband having sex with someone else. I can’t explain it, because obviously if I did catch him, I’d lose my freaking mind and probably murder him. Thinking about him having any type of relationship with someone makes me angry, but picturing the sex turns me on. I guess I compartmentalize it while I’m turned on, idk. 😂

Is this normal? Or at least understandable? Does anyone have any ideas on how to get the most out of this fantasy without actually doing it or encouraging it?