Sorry about my spelling and grammar hopefully it makes sense

I 28m and 27f told me that she's into 3somes because that's her kink and I what guy wouldn't be (am I right) but l asked her if she would wanna have one and said yes. A few months past and I asked her with who or just when we would have one but she never had an answer, but when I said her if she would want guys or girls she said girls more then guys. l've only asked her a few times about it, if we can have one and said yes but then she gets mad/ jealous so I tell her we won't/don't have too be she wants too but I don't being it up because I don't want her upset or mad but she's the one that brings it up and when I ask her it's the same thing, it's a yes then no so l'm confused on to why would she bring it up then she gets mad but when I asked her to talk about it and why she brings it up and gets mad she just won't talk and stay quiet so basically how can I ask her were she would talk to me about it?

Side note all her friends or gay or bisexual and some of them or good looking and back in the day she has had 3some before and has told me that she wants one and is into it