1. You don't like his mother.
Even the most love-struck man would never allow his partner to speak ill of his mother behind his back; this is one of the biggest taboos in relationships. Keeping your opinion in check is also a way of protecting your own boundaries.
2. Being picky about his physique
It's not just women who care about their bodies; men are just as sensitive about how others perceive them. Just as you don't like him commenting on your appearance, please don't casually talk about or ridicule his body!
3. Threaten him with breaking up.
Threatening him with a breakup is an incredibly foolish idea. You might just be saying it casually, but he might take it to heart. If you repeatedly use this as leverage, be careful; next time, he might be the one seriously saying "breakup," not you.
4. Be honest about your past infidelity.
Whether you've been unfaithful to him or your ex, it's best not to confess easily. "Truth or Dare" isn't just a game; once you tell the truth, you can't guarantee he'll treat it with the same care and understanding.