Found out guy I met on Tinder has a girlfriend? What should I do?

Anonymous
Met this guy on Tinder, been on one date and it was nice. But because I'm a huge stalker I search him up and find his instagram and saw he has a girlfriend. Of three years. Now I'm debating on whether or not I should just stop contact with him, confront him, or tell his girlfriend?

Thoughts?
Found out guy I met on Tinder has a girlfriend? What should I do?
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