What does it mean when a guy sends pics out with his friends?

Anonymous
I've been talking to a guy for a few months, no dates yet, since we're taking things slow due to bad past relationships. He randomly sent me a pic out with friends drinking the other day, something he's never done before. I recently went on a trip to see old friends, but I don't think that is connect unless he was jealous. What does it mean?

I'm relatively new to dating for my age.
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Edit: I was in a LTR for several years so I'm new to this new dating world, photos and texting wasn't really a thing for my previous relationship. So be nice with responses, please.
What does it mean when a guy sends pics out with his friends?
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