it's a mix of different reasons. A little bit of PTS form AL, they are a little bit less interesting, ( kind of like Jill
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), and they are bisexuals, and you are not exclusive. With every other love interest, MC is the center of the universe, as i explained it couple of days ago. in J and M case you are not enough, they want each other too. and because of that players feels less about themself. You either like both of them , in this case choosing between them is always gonna be fucking hard. or you like one of them, but you cant see J or M as an antagonist. unlike Tybalt, or Chad, so people rather stay out of them. otherwise they feel like a third wheel. but they cant see one of them as enemy, so they wait for them to break up, and then make a move on the girl they like.
they don't hate separately them, peoples just bothered by that they are together. like in the library, "how dare they kiss behind my back "
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which is funny because many of the same people's wants threesome with Bella and Jill, and with others. Quinn and Sage etc etc.
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