My ex boyfriend is gay?

I meet this guy and we really connected and he was so sweet and we started to date. In that 4 months his younger sister became my best friend. Then out of the blue he dumped me bc je was working out his sexuality but he said we can still be friends. I stil hang out with his sister but i can't help but feel betrayed and upset when i see him, what should i do? Im 16 by the way
My ex boyfriend is gay?
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