How do you tell if you wife is fucking asnother guy?

I could really use some help.or feedback,or something on this,trying badly to find out,and yes ,I have asked,and she wont tell!If her pants are dry cum stained,when she gets home from work,and we havent for a week or so,or we go to fuck,and a streamer is there,and she looks like I just fucked her,or she won't let me eat her,when she gets home,even after she showers,and thats her favorite thing,me eating her!!A lot of times her cunt feels stretched,and wet and gooey,and she quit wearing panties,she would never ever do that years ago,it was to improper,especially to work!!!And I notice when I get home,our room smells like a porn shop!Now heres the thing,and figure this out,she dont drive,doesnt have a car,and gets a ride with a female friend back and forth,and we are good friends with this married couple,and they are country as hell!!And the wife works in a lil restaurant,in the country!!Now she knows I want her to fuck other guys,and I want her to be a cum slut,and even a bbc slut,and when takes,she gets into it,and really acts it out,but sober,says it will never happen,and that is degrading to her,me wanting her to do this!!So there you have it,great to see if some one can solve this,its *******ing me!!!