If you went for Bella path and also dated/expressed feelings for Jill, then Jill will be deeply betrayed by both you and Bella so that would be brutal. If you're on Bella path and did not date/expressed feelings for Jill, then Jill will feel betrayed only by Bella which might be forgivable.So I play Jill path as my main playthrough and since episode 8 release this is my first time trying bella path and the ending was just too brutal for Jill if it goes like that I doubt I'll play a bella path in the future update.
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Bella was the one who encouraged Jill to date you in the first place (though the reason is she loathes Tybalt) and then Jill just surprisingly sees Bella riding you. As close as they are, Jill will definitely feel betrayed.