Grinding Alone?

I know a friend who grinded by himself in a club FULL of people for 30 minutes, three times a week. I must emphasize that he grinded alone? How is this even possible? As his best guy friend, should I offer to grind with him? Mind you, I am not gay, I am grinding girls as I watch him grinding alone and I feel quite bad. Do you have any tips for my friend? How can I comfort him when he feels down afterward and has the terrible realization that he grinded alone?
Grinding Alone?
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