What could he say or do?

Okaii my friend has come out of a really good relationship but the girl ended up having sex with his best mate and other guys even though she said she loved him and wanted to wait for him as in until he has done other things in his life and now he wants...

to know what he could do to her to make her feel just as much hurt as he has. What could he say or do?:s

If it was a good relationship she wouldn't have cheated.

Tell your friend not to do anything. Hurt people usually hurt people... and I know he's upset about what she did but he needs to grow some balls and be the bigger one in this situation. Don't go out your way to hurt this girl.. it's not worth it and you'll just end up looking like an asshole. If you want to cut deep but keep your dignity, then kill her with kindness. It always works. Keep your head up and push forward, and let her dwell in her own failure. You'll feel better about yourself, trust me. That's it.