(Ask Misty): My Fiance Wants a 3 Way!

Dear Misty, I'm with the man of my dreams. i love him to death and we're engaged to be married. He's interested in threeways because he says "he loves pizza but he can't eat it everyday", should i be offended by this way of thinking? he knows i'm uncomfortable with 3ways and always tells me we don't have to have one, but he says it in such a disappointed way that i find it hard to say no, and it makes me feel awful, he doesn't do it on purpose though. the first time we had a 3way i got so jealous to see him touching another guy sexually, is this normal? he always says no matter who we have add to our sexual relationship he will never leave me and he will never enjoy sex more with someone else than with me, because he says with us "its more than just physical, because we have a mental and emotional connection" and he says that sometimes when you have sex often that connection can get lost or forgotten and that a 3way would just help him to appreciate the connection he and i have more. he doesn't ALWAYS want a 3 way, but he wants them and i know he does. could you help me out, i have no idea how to take any of this, i feel so lucky to have found the love of my life at my young age, but i don't know if adding a third person to our relationship will be more damaging than helpful. FROM Incensedsiren