I think i want to watch my wife have sex with another man.???

my name is robertb, i'm a 51 yr old man, been married to the same woman since 3/24/99,she works at the truckstop fuel desk at night .....thats where she met frank.,one night she was telling him about the things i say to her and he said there's nothing wrong with you, i like big women there a real turn-on.(my wife is telling me this about the nights when frank stops by whenever that would be) one time she told me that frank stopped by and he told her if you show me your breasts i'll take you to south dakota with me.after i heard this right away i was hurt that she's going over to frank for sex because of something i did or said. but then before i had a chance to get upset the mere thought of her and frank naked together REALLY started to turn-me on,I MEAN LIKE OMG!!! i'm getting turned on by thinking of her and frank in bed together.this was unreal and that thought made me hornier.now what i'm about to tell you,my wife carla has no idea that i secretly feel this way.one day we were coming back from south soo walmart, some how we ended op on the subject of sex and yes you gu essed right it was about frank. i said you know? he's never going to give op til he gets you and she said only if i let him. which changed uor conversion to anyway .....the ending sentence was ...well if i was going to do it with anybody i'd be frank.she said that months ago if not longer.today....3/22/11 she let me film her with my smart phone for the first time since i married her in 1999. today i pretended to find my wife on the net,i told her i wanted to film her and she said that would be fine ( and didn't say no)so i kept going,turned on the light and turned on the video phone an watched her get turned on ...knowing that i was filming her. while i was filming her get turned on in front of me was the thought of frank being with us jumped in to my head, watching her give him a blojob or watching him on top of her was making me even hotter. now i don't dare tell my wife about this thing i think i want very badly.i don't know if i want her to know about this fettish nor not.knowing all that was said.....why after all this time is thought of watching her and frank together TURNINIG ME ON SO MUCH.somebody please help me. my wife is really gonna freak if she finds out.