Really depends on the relationship. Did you discuss your previous sexual partners and this is something she left out? If so, then you have reason to be upset, since she lied about it. If you didn't want to know her sexual past and then found out about it later then you don't have much reason to be angry. I personally would have found out about her sexual past before the relationship became serious, since that is a concern for STD's and other problems. Just my
