Why I am I treated like an outcast amongst my friend group?

Me and my friend group have been hanging out for about 3 months now. I then introduced my other friend to my friend group (bearing in mind had no interest in associating himself with them and still doesn’t) and then all of a sudden my friend gets all the attention and the craziest part is that I have non (not a single one of) of those people’s social media’s or numbers which I have asked for on multiple occasions and all of a sudden my friend has all of them on social media and gets dm's from them daily and all of that without even asking once. Am I that horrible to be around, did I do something wrong? 🥺😔
Why I am I treated like an outcast amongst my friend group?
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