It depends on whether she did it out of love for her ex-es or
easy-rider/for $$. If out of love, its natural lah. Since she is so
experienced, can teach u a thing or 2 mah. U will become a better
lover. ha ha.
Its in the past. As long as she is true to u during ur
relationship, appreciate and love her. Be thankful that she is not
doing it now!!! 
However, if it bothers u so much that it affects ur relationship,
let her know and talk it over. Take some time out to think over it
and u will know what to do. If u can't accept it, break off. Its
only fair to her and urself.
