GUYS help! what did I do wrong?

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It doesn't sound like you told him anything that would send him running for the hills. He is with his friends and when he is with his friends, he is not going to leave them to hang out with some chick. They will call him names if he does so he chooses not to. He told you he would go if you are with your friends because he most likely wants to go with his friends. He wants you to take your friends and him to take his so everyone is having a good time. I have a main friend so whenever I get a woman's number, I ask if she has a friend so we can all go out together so everyone can have a good time.