How can I tell my best friend that her behaviour is really annoying and upsetting me?

[Erin]

My best friend Lucie and I have known each other for about 5 years (I'm 16, and she's 16 in August). Both of us are quite shy, not that pretty, and not that popular. Last year, she switched schools from our all girls school, to a mixed school, but we still see each other regularly. But recently she has been really p*ssing me off. For New Year's Eve, she got invited to a party. Afterwards, she rung me to brag about how drunk she got, and about all of the guys she made out with. She also posted the photos all over twitter and facebook, and she acts like it's an achievement. I made some sarky comments about how it's nothing to be proud of, but she just said "you're jealous because nobody invites you". I was furious. And she's been to two parties since then, and the one two days ago was the last straw. There are photos on facebook and twitter of her grinding on and basically dry humping this random guy, and there's one of them doing body shots. She seemed so proud. I've never seen something so classless and disgusting. She's 15 too. And yesterday she kept trying to ring me, presumably to brag about it. I'm sick of her behaviour. How can I tell her that what she's doing is really upsetting me, and that I think it's wrong?

[Rebecca]

It sounds as if you're ready for the friendship to be over; you don't want to have anything to do with her, and you find her behavior to be wrong, also, you're not even at the same school or anything. If you're ready to be done with her, then just be done. Good luck!

[Pegamoose]

Comment on her photos saying something like "You are being a slut. Ew. Sorry but you have changed and it annoys me. goodbye." or just ignore her and make new friends.