Like an explosion in a Mars bar factory

Last night me and my girlfriend tried anal sex for the first time, it was a complete disaster. As the title suggest's it ended like an explosion in a Mars bar factory, it was all going well and then suddenly took a turn for the very worse. She ran to the bathroom crying and told me to leave, I did as I was in shock as to what just happened. We haven't spoke since, she isn't replying to texts or answering her phone, what should I do?

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