Sheesh, this is a tough situation. I think if your friend really was your friend, he wouldn't make you go- He'd make up an excuse for you.
However, if you wanna be tough (usually a WAY harder choice...I know, I get social anxiety sometimes), then you'll just have to suck it up. I think the best thing to do is not pull a dramatic scene or anything...just ignore her. Have a good time with your friend and his newfound 'crush' and whoever else is coming. It HAS to be hard, but it's the only thing that will keep you from totally going crazy, I'm guessing. Just be yourself in the company of others.
If she approaches you, be friendly and politely, but brief, before things get heated. I know that I was 'friends with benefits' with this one guy, and he tried to act chummy to me after kinda dumping me for some other girl...I just pretended he was a stranger that I had just met or something (I talked to him with a big smile, acted like I didn't have a grudge...blablabla). Then he left me alone. It will help you get over her, if anything, if you can do that.
Sorry I wrote so much. I just hope everything works out for you, and good luck!
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