Why didn’t my friend invite me?

we just met these 2 guys and they’re sweet and we got their snapchat’s not their numbers and she went in their house and hung out with them… like for one why didn’t she tell me about it and why was she hanging with them alone even though they seemed nice it’s not safe. i was like you went where was my invite lol and she was like i went a couple of days aha. also i remember when we were in a group i said aww want to be friends you guys.
Why didn’t my friend invite me?
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