Woah.
Okay.... So she was dating this guy for 2 years, broke up with him, then a month later shes with you? And she's cheated on you already? Things aren't looking good... But she did tell you, so perhaps she is willing to try to make things work.
Talk to her, tell her youre worried about this. Don't try to get too controlling with her because that will backfire on you.
Good luck
