4. Talking about what your ex used to do, such as, “My ex used to always walk on my right side.”
Women usually don’t welcome these kinds of comments, even if it’s just a slip of the tongue. There’s no benefit in talking to your girlfriend about your previous relationship—it will only put her in a bad mood. She might even come back at you with something like, “So what?” Be mindful not to mention your ex in conversations, especially if you tend to speak before you think.