That depends on a lot of things. I've heard scenarios of exes getting back together and making it work the second time around. I don't think there's anything innately wrong with getting back with an ex. Unless they were unfaithful, then yeah, that's never a good idea. But otherwise, if the cause for your breakup was something that can be resolved and you believe things can improve this time, then go with your instincts. In the end, it's up to you and what you think is the right move. I would only suggest considering it very carefully if you're sure it's a good idea.