How can i get rid of my fetish? I hooked up after my girlfriend cheated on me

*ignore the grammatical mistakes eng isn't my native language* since after when my gf told me that she cheated on me i somehow ended up getting into cuckold porn then it lead to the interracial cuckold i have number of ir amature cuck porn and it always gives me an erection thinking about them nothing else get me off but the problem is now i have another gf i'm over the previous one but now i fantasize sharing this new gf with people and i don't think any good will come out of that we love each other i haven't told her about my fantasies yet and never want to but it scares me that someday i might give in to my desires and fantasies. (i'm average looking person having average size junk 6'3 sure can satisfy my women in case you think it's caused by envious or self pettiness)