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Loads of times, with two of my boyfriends. More than once too, with my last boyfriend we broke up and got back together four times.
I guess the reason was that for me, at least, it's hard to swallow the fact that you've put time and effort into something that just broke, and to start all over again with someone else. Also because it's kind of an ego-boost. And, of course, in the first period of the break up you still kind of miss them.
But I would say this: it was not worth it. It was loads of drama and I felt like I was living a nightmare. Unless you have a really really good reason, don't get back together. You broke up for a reason. Trust me, 90% of the times it crashes and burns...:P