You guys are rather taking this lightly

Like I said before: I want to
break this cycle, NOT just sit back as it comes around full circle.
Yeah, fine, a girl decides to never text or call me back b/c she has boyfriend priorities...
but what about her group of friends?
I can understand to a certain extent why a girl would decide to stop making contact with me altogether,
but what makes me so different from all her other friends? What do
they have that I'm lacking in? There's gotta be something that enables them to still be friends with the girl despite the girl having a boyfriend, or there's gotta be something I'm (not) doing...
I've always let these things slide by allowing nature to take its course: make contact, exchange numbers, meet up, split up, forget everything, REPEAT. But one thing I haven't done yet is actually call the girl and confront her about where our relationship stands. Should I call the girl just to clear things up?