How to get over getting cheated on with her best friend?

So apparently my girlfriend (who's now my ex) had been FUCKING HER BEST FRIEND BEHIND MY BACK, she always told me to trust them and I shouldn't worry about a thing, I've always been against friends of the opposite gender in a relationship but she kinda changed my mind about it BUT APPARENTLY I WAS RIGHT and opposite gender friends are a stupid laughable concept in a relationship.

How do I get over this shit? And how do I tell my next girlfriend to dump her "guy best friends" or else I'm leaving?
How to get over getting cheated on with her best friend?
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