My ex's new partner is copying me and it's freaking me out

hi guys!! weird situation ahead lol. so i was with my ex for almost 3 years (i’ve posted about him previously while we were still together) and we’ve been broken up for a little over 3 months. he already has a new partner which has been hard for me, but i’m finding myself feeling better every day. however, something happened recently that has been weirding me out a LOT. so i’ve worked the same performing job for 5 years. it’s the joy of my life, and it’s what i want to do for the rest of my life. i had this job before i started dating my ex, during, and after. his new partner is someone he was friends with while dating me, and they were aware that this is my job and that it’s something i’m very connected to. well. his new partner has gone out and started doing that same performing job with a company i also work for, despite showing no interest in doing the job while i was with my ex (their current partner) i’ve been feeling a little weirded out, because it feels like they’re trying to be like me?? dating my boyfriend of 3 years right after we broke up and then starting to do the job i’ve been doing for 5 years?? it’s all just very strange to me. i’ve never had this happen before, and i don’t know what to think. i have pretty bad anxiety so i’m spiraling a little and wondering if there’s more of this copying to come, how to deal with it, and if i should be worried at all about these actions. and an important note: my breakup was not messy at all. so this is very out of left field. i thought i was on somewhat good terms with my ex so i feel very strange that this is happening, since i feel like any logical person wouldn’t start dating someone new right after ending a very serious relationship, and if they did, would tell that new partner to not go get a job where their ex works. anyways, advice (or just verification that this is weird and i’m not crazy for thinking it is) is appreciated.