I got dumped what next?

My girlfriend(23) cheated on me a while ago. After a couple days I decided to take her back. During this period I began watching cuck porn. After we were back together I decided to put on a cuckold video for us to watch. She enjoyed it and we began watching cuck and solo male porn often. Things were looking like they’d soon come to fruition. We began roleplaying and dirty talking about cuckolding exclusively. We recently broke up and now I don’t know what to do. I still have fantasies of her cucking me everyday and can’t get my mind off the idea of how she’s probably sleeping with all types of men. It’s such a hot thought but will these fantasies ever stop about her? How do I navigate being a single a cuckold? How do I introduce this kink to my next partner if I decide to? Should I call my ex and ask her if she still wants to fulfill this fantasy?