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“Anything I don’t understand personally means you’re narcissistic” 
Can we please stop taking away from the meaning of that word and cheapening it by saying dumb shit like this?
Who says the point of a relationship is to sacrifice a bit of ourselves for someone else? While any long term committed relationship likely involves some sacrifices to assert that is point as fact is misguided and narrow-minded. 
But you do you, if that is the point of your relationship then have at it! None of my business just as other people's relationships are none of yours. >

Nah, im not poly but I can see having feelings for multiple people and both people acknowledge that and are okay with them continuing to see that person. Im way too fucking insecure for that but certain people arent. OP Im sorry for whoever hit you with the “Im poly” i can tell this post was made angrily >

I really don’t think not wanting your partner to see other people while dating you is “insecurity”