First of all.take a deep breath. Cuz as the feeling sinks in you might be out of breath for sometime. Now as to what a girl should do: 1.
If your girlfriend/boyfriend has been cheating on you, don't let their lies and deceit drag you down into the gutter with them.
Do you have a feeling that your bf-gf is cheating on you? Want to know if it's true? Here are 15 ways to find out if you are being cheated on.