Should I let my girlfriend go fishing (my hobby) with another guy that I have hated for a long time? She never wants to fish with me?

I have asked my girlfriend many times to go fishing with me but she never wants too. This guy I've hated since before me and my girl started dating asked her once and she wants to go.
Should I let my girlfriend go fishing (my hobby) with another guy that I have hated for a long time? She never wants to fish with me?
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