Threesome??

Carmen
Who here is brave enough to tell me about their threesome experiences??
Last year my boyfriend and I considered having one just for the sake of "trying everything once" ,my idea by the way. However, I called it off after I read some messages between him and the girl (let's call her jelly) we were considering asking. He said that he loves his girl(me) to bits but he's always found her (jelly) down right fascinating. It hurt me, maybe I overreacted???
But I felt it was too emotionally invested because he admitted he used to have a crush on her.
Anyway, now I'm thinking about giving it another go. I haven't told him anything I just want to know from other on here how it left them and their relationship afterward??