Women get upset when men hide and lie about things. Of course she will get upset when you tell her but that is NOTHING in comparison to how betrayed and hurt she would feel knowing you were keeping it under wraps. We are capable of hearing the truth Scotty. But at the end of the day you know your girlfriend best. You know how rational or irrational she can be so it's up to you. I just feel telling her would be the right thing to do. It is what i would want my boyfriend to do if something like this happened. And i can guarantee you i wouldn't unleash hell's fury on him or break up with him.