Should I invite my childhood friend to our wedding even though my fiancé says not to?

So I'm trying to come up with a guest list for my wedding and I've added and erased my childhood friend. Here's why.. 1. She messed around with my fiancés sisters boyfriend years before they even started dating. So my fiancés sister hates her guts. 2. She occasionally sleeps with my fiancés brother even though she knows he's in a relationship. She's my good friend and My family says I should invite her but my fiancé says I shouldn't because he doesn't want his siblings to hate him. What should I do?? 

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