What should I tell her?

A friend of mine called me up crying tonight about this guy she had dated a few times..She saw him with another chick..she was devastated. I guess she saw them in the parking lot outside her work place. She said when he saw her he started coughing out loud and saying woo-hoo or something. She said she is going to quit her job tomorrow. I am worried about her. I told her not to quit her job over this. She asked me what she should do and I said to go to work and suck it up. Why do men do this to good women?