ah yes other people
That's one of the reasons that forums like this are so important. The magic of the internet brings us all together from all corners of the world. I know of no one in my life who understands about my partner's poly life. I have talked to a few people and they always say "I would never put up with that", so I've just stopped talking about it. This is probably what ML has come up against. It's hard to go against the cultural norm.
My partner has tried to pull back from his secondary for my sake and I felt like part of him was missing. I ended up telling him I would cope with it and to resume the relationship. Maybe this will happen for you.