hhehhehehe.... XYZW.... 

observe her again closely and analyze her behaviors for at least a year as a good fren. if she has truly changed then i don't think u should deny ur love... people makes mistake... and if u forgive her this time then it would be appreciated life long.  keep dating wid others as welll. if u find that it was just an another lie then simply move on.... don't get too emotional during this period...