Readjustment? [cuckhold perspective]

I recently went through a pretty rough breakup and am in a really bad funk. We were together for 5+ years and had plenty ups and downs, (mostly caused by me) but always felt like we could work through them. We had broken up before a few years ago, but even then fully intended to get back together and did. Well this time around it feels much more like a broken up for good go around.
She’s off dating other people and seemingly preparing to if not already living out fantasies. I know this not only due to us meeting on a dating app and knowing how forward she is on them, but also from having to see some messages pop up on her phone as we were still living together for a few weeks post breakup and she did not want to wait long to put herself back out there.
I have been handling this poorly mentally and at this point just want her to get it over with when it comes to being intimate with someone else. Just in the few texts and photos I’ve seen she’s clearly more than comfortable with other people already and has completely put me on the back burner when it comes to a romantic connection physically. So in a way i think the best way to navigate this is for me to just accept I’m obsolete in that way and that she has found and ready to pounce on multiple new options while doing things she either hasn’t done in years with me or has just never shown enthusiasm doing with me period. Has anyone been put in a similar position on here or had comparable thoughts? DMs open.