I (35F) am dating two people. One of them, my NP of 2 years, has a gf of 6 years. They want to propose to gf this year and while I don't want to marry them right now, and it's supposedly not a single person slot (not legal marriage), I do NOT feel good about this. I am okay with some seniority but I struggle not to catastrophize that hierarchy is going to threaten my relationship. I have talked to partner abt this (obvs) and they're very willing to process on it, but as someone who has literally never been jealous before I am NOT comfortable w this emotion.we are KTP but meta and I aren't close-close, and I'm not sure how to check abt expectation setting w/o looking like I'm trying to force her life to be a certain way. I just am not secure that partner's predictions/descriptions are the same as meta's. I am willing to walk if it winds up sucking too much. Partner is willing to convey any message to meta and loop meta in for convo w me OR middleman it. But this feels so controlling of me and so awkward.