Good sign when he introduces you to his friends?

unsureofeverything
So this guy I've been hanging around with and casually dating asked me to hang out with him and two of his friends last night. I got along grreat with them and we spent the night laughing and goofing off, and I think they liked me. Do guys only introduce someone their dating to friends, if they see it going somewhere, or is it like some friend approval thing?

The guy in question kinda acted a little differently towards me the whole night, not bad, but not the same or nearly as afficinate and I'm not sure if it was because we wern't alone or whatnot, or if this is just how he is with his friends.
Good sign when he introduces you to his friends?
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