My tinder date has a girlfriend?

Anonymous
So I just went full detective mode on Facebook trying to find this tinder guy.
After about 30mins I found his profile. His display picture is with a gloriously beautiful girl and it says his in a relationship.
We have met for dinner once before and he has booked a hotel this Friday for the two of us. Apparently it's his birthday! Don't judge me please!
I fucking knew he seemed like a player and too good to be true!
But how should I go about this?
Stop texting?
Blast him over the phone?
Tell his Mrs? Help?
My tinder date has a girlfriend?
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