bicurious???

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Okay this might all seem a little odd but i’m confused lol. I have been in a straight relationship for 4 years in February and I am very happy and satisfied in my relationship but recently my boyfriend has been mentioning a 3sum with a female (we have had a 3sum with a male and we both enjoyed it but decided it wasn’t something we were going to do all the time maybe just here and there) anyways i’ve always been on the fence about it with a female cause jealously and the fact i’ve never had the desire to be with a women so he stopped mentioning it but now all I can think of is us being with another girl. I want to see him with her and i want to be with her myself. Now back to my questions, I don’t think I could be with a female romantically (nor do i want to cause i’m happy in my relationship) but does me wanting to have sex with the same sex make me bisexual? bicurious? or would i still be straight? Also should we go ahead on this 3sum? I haven’t talked to my boyfriend about my change of thought just cause i’ve been trying to figure it all out before hand. Thank you