Storytime: I was dating a chick who, after two fucking years, asked me how I felt about opening up the relationship. I said fuck no, I'm not a Mormon, swinger, cuck, etc. And from then on, I was incredibly emotionally manipulated by her and the poly community. She told me I was confining her, and that if I truly loved her, I would let her experience love to the fullest, "because she had a lot of love to give".
She sent me books, videos, websites, that all told me what a piece of shit I was if I didn't allow myself to be cucked. She even fucking took me to a "poly friendly" therapist for the specific purpose of turning me poly. She and her friends fucking sent me "poly memes" every day, it was a complete fucking indoctrination into a cult. And this was someone I thought I loved, and cared about me. I genuinely was gonna reach my breaking point, and I was convinced I was a bad person for feeling repulsed at the idea of "sharing" my girlfriend.