How do I slap some sense into my friend?

Ok overall summary of the issue: Her boyfriend wants another break after they started going out like 3 days ago. This has happened many times before. It's driving me crazy and I'm sure it's driving her crazy too. I want to be completely callous and just shake her and say 'dump him and move on... don't look back. He's wasting your time!" But I know she's gonna be crying and upset and I'm gonna feel bad for being so blatant. What should I do?