Yes, you should run. It probably doesn’t do you any good to tell you this now, as I know how intoxicating those times can be, but you should run. I was in exactly this situation. Also it WILL be hard to find equivalent sex in the future. Just try not to think too much about the fact that you might have now peaked in that regard.
If you get to the point that you want some helpful answers, consider reading Attached by Amir Levine and Rachel Heller. I read it one night, it was so helpful back in the day. See if maybe it touches any sensitive areas.
https://www.simplypsychology.org/narcissistic-mirroring.html
In practice, she seems like the ideal partner. Forget girls who don’t like your hobbies, she’s into the same hobbies (now)! Maybe you go over one day and you realize all of the music playing is stuff that you’ve been listening to on Spotify. She checked.
It’s beyond flattering into, “okay, slow down” territory. One of the ugly sides being that she would do that with others, too, she acknowledged she didn’t know what her own personality was anymore. She struggled with her sense of self-identity. It’s hard to capture how it could feel really creepy and, ironically, isolating.