Friend Ditches Me for People She Can’t Stand

I feel like I’m actually going crazy. My close friend (F19) and I (F19) have had a really good friendship ever since we’ve met. We get along so well and have the same sense of humor and have never really had issues for most of our friendship. However, I’m starting to notice that she will talk badly about her other friends to me, saying stuff about how she secretly resents one girl, is starting to not be able to stand her other friend, and just little jabs at them or snarky remarks.

The thing is that when those friends ask her to hang out or invite her out, she immediately runs to their beck and call. Like, she won’t always be able to see the friends she likes, but as soon as these girls ask her to hang she’ll be there in an instant.

She told me the other night about how she was starting to be unable to be around one of her friends, and then today I found out she asked her to come with her on a long trip. I’m just so confused, and honestly hurt I wasn’t asked? When she’s said we’re closer and that she likes being around me more.

I just don’t get it and I know Im being taken advantage of but like, if you seriously can’t stand these people, why do you always go to them when they ask, and why do you ask them to come with you on things instead of people you like???