Ok i need to vent, and adice would be very nice!

Alright, one of my friends is STILL mad about something i did in SB. She hasnt even tryed to help out our frienship. I guess i was supossed to watch my friend down in SB, when she was staying in my room, and well we snuck out and met up with some guys. The word got out, and she hates me for not being responsibe for her.. the friend i was with was tipsy, and i guess it was my job to watch over her, which i did and everything went fine. The thing that pisses me off is that shes still mad, and arggg..

So last night some of my friends hung out with her, and i txted one of them joking saying... " Tell claire that i cant babysit you tonight.. lol " and i guess she saw it, and now everyone pissed at me, and saying why would you send something like that?

First of all: Me and my friend joke about the situation ALL the time, and its her job to not let claire see the txt.. unless she felt like being a bitch, and showing her.
I now feel bad, becuase i hurt claires feelings, but it wasnt ment to turn like it, i wanted our frienship to be ok now..

Argggg please help me out here, i'm so damn confused!

i dont get it, what did you do wrong in the first place, im confused?

OK well i didnt want to post the situation agian, but i will.
Long story shot. Me and my 3 other friends we down in SB. We met up with some guys, then my one friend sarah lost her room key, and was tipsy( not drunk) i said she could spend the night in my room, and find her key tomorrow. My other friends (whom i'm in a fight with) Told me to watch sarah, and to not sneek out, because she wouldnt know what she was doing. I said i would watch her and not let anything bad happen. Megahan went back to her room. Me and sarah got bored so went back to the boys room, where some shit happened, but nothing bad. We get back from SB and meghan herd the news, and bitched at me saying that i should have listened to her good advice, and that it was stupid of me to let her do something like that, and that i was a bad friend etc. I think that she overeacted ALOT, maybe not. I havent talked to meghan sense, and sarah and megahn are good friends now. So she forgave sarah, but not me..
Last night sarah was hanging out with meghan and i jokeinly send sarah a txt saying " Tell meghan sorry that i cant babysit you tonight lol". When i called sarah this morning she bitched at me saying that why would you send me a txt when i was with that person, meghan saw it , and is now even more mad, are your not helping the situation.

I feel bad about the txt that i sent, i didnt intend to have it shared with anyone else but satah, and i think i have dug a deeper whole then before...

I want to make the frienship all better.. but i dont know how, everything i do i tend to just fuck up even more...

With that info, please give me advice..

Sounds like ALL of you girls need to grow up and start taking responisbility for your own actions before you start judging everyone elses...both you and your so called friends seriously...