threesomes

I am completely and utterly heartbroken right now... my husband has talked to me about threesomes before, as well as swinging. and like, im not for it, at all, because i get super jealous. and like, i thought he was wanting one because it like completed some guy lesbian-like fantasy and so i asked him to explain what was so enticing about the idea of a threesome, not expecting the answer he gave me. he said he wanted one because hes my first and im his second and he wants to try new things but its difficult to try new things with one person. he basically just told me he wants to try new people. i wasnt trying to "trap" him, i was fully expecting an "itd just be super hot" kind of answer.... he says im enough for him but if thats the case... why would he want to try new people...? not looking for advice or sympathy, just needed to vent and cant do it anywhere else anonymously.... but honestly, im so hurt right now...