So my fiance is bi. We've been dating for close to 4 1/2 years and have been engaged for a few months.

Only a few days ago she was browsing on craigslist and found a cute girl that she wants to hook up with.

Now she's never even kissed a girl but she says she's really attracted to them and has asked me in the past if it would bother me. I never knew exactly what to say so it always came out like, "umm, that's kind of odd, I don't know I suppose I can't give you an experience like that so I guess not." I never thought she was serious.

So a couple days ago she tells me she's been emailing this girl and she wants to hook up and mess around sometime. This is something she's never done and always wanted to do so I'd feel selfish if I told her no but at the same time it makes me really sad to think about her with someone else, guy or girl.

She claims that she will just experiment and that will be the end of it. But to me it seems like playing with fire. Can she really be sure that nothing more serious will become of this?

Part of me really wants her to have this experience. I want to see her happy and to be able to finally know what it's like. But another part of me feels sort of betrayed.

I suppose I'm just looking for some feedback.

It's not like she's stopped having sex with me, she always tells me how attracted she is to me and guys in general but she really likes girls too.