1. When you're puking your guts out.
2. You look over to see him making out with another girl.
3. He suggests you guys go back to his parent's place.
4. It's your bff's ex bf.
5. He offers to drive home hammered.
6. Or is willing to let you drive home hammered.
7. You suspect he might be a serial killer.
8. He's a little too excited about bringing you back.
9. He's got a ring on his ring finger.
10. If you think you might end up in a situation like this in a couple months...
Because when you do go back you might find yourself saying...
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