Fiance 35M told me 27F wants to have sex with my best friend

My fiance told me a few weeks ago while he was drunk that he wants to have sex with my best friend. When I sober asked him what he was talking about, he went on drunkingly to tell me she was his type sexually and not me. That if we both walked into a bar he would make the choice of her. I have had a hard time processing this, and a hard time not comparing myself. I get that finding other people attractive is normal, but this feels different. Am I wrong ? I don’t know how to get past this and would like advice