What should you do if you met a girl online and have been talking for a long time and you were going out and she was going to move down here then you found out she was cheating on you with her ex?

I think that if that happens you should soooo totally tell her up front that u found out so n so n make sure before u tell her u are shure she is cheating on u....n if she is then tell her u dunt like her anymoree and tht u don't want her to move down there n if she does u wouldn't caree or sumthing like that n try n get over herr but most imp. MAKE SHURE SHES CHEATING ON YOU BEFORE YOU TELL HER ANYTHING!