Should i go back with her?

me and my ex broke up like a month ago. she sys she loves me with all her haert and i love her. we broke up for some probles we had that wouldnt go away. any she sys she still loves me. however like 2 weeks after we broke up she started going out with a guy, whith whom she broke up with after i told her she was a *****. My question is, even though our original problem seems to be going away, should i go back with her, when she started dating another guy just two weeks after i supposedly broke her heart? Or is she in reality a that i should forget about?