Idea of girlfriend fucking her ex

So I dated a girl for a few years but she left to another city because she got a good job offer. The relationship pretty much ended we didn’t want to do long distance. The thing is I know her ex lives in that city I fantasize about being a cuck and letting her fuck around as long as she records it. That is if her ex hasn’t already fucked her which I like to think he has ?. I fantasize about letting her be a slut and get dicked down by either her ex or a random guy. Maybe letting her ex creampie her. Do y’all think she’s getting some dick already? Should I tell her my fantasy? I’m a very jealous guy but it turns me on