Most Helpful Guy
Its not true that only guys are mean after a breakup, because girls can be the same way too. Its totally gender neutral, and only depends on the individual.
Your question doesn't seem to be clear with respect to who initiated the breakup. If it was you who dumped him, then there is a good chance that he might accept you back in his life at some point. But if it was him who dumped you, then your chances are significantly low (although its not impossible).
By the way, you mentioned that he changed his mind many times. Irrespective of the reason, it seems to suggest that he's an immature, fickle minded guy who changes his mind often. Hence, I'd definitely recommend you DON'T get try to get back with him. You don't really have to be with someone who changes his mind so often.