This is a friend that I've known for a long time. Lets call her Mary. We never hit it off romantically, but just flirt here and there. She knows I only like her as a friend, and call her out to socialize with others.

I meet this new girl through a friend and hit it off. I went on a couple of dates with this girl and everything is great (kino escalated into making out, etc).

Mary found out I'm interested in this girl, got this girl's number somehow (through mutual friends) and called her. They drank together to discuss the situation between me and the new girl...WTF? Also, she specifically told the girl not to tell me that they met...WTF x 2? Which the new girl ended up telling me later on...

I don't know the specifics of what was said about me, but the new girl started acting differently towards me and they are now somehow friends and I recently found out that they hang out now... another WTF??

What should I do about Mary? She's been a good friend for about 8 years now, but here and there I've been getting that cock-block vibe from her sometimes during the course of our friendship. Is ending my friendship with Mary the best thing to do? This situation has got me confused and angry at the same time...

edit: grammar