Stay away from the ex-girlfriend

This is, granted, an extreme example. But it's an illustration of why it is always a terrible idea to remain in contact with one's ex-girlfriends and ex-wives when one isn't required to do so.

Anna Mackowiak, 34, is facing jail after taking her revenge on 45-year-old Marek Olszewski when he turned up at her surgery with toothache just days after breaking up with her. She gave him a heavy dose of anaesthetic and plucked his teeth out. She then wrapped his head and jaw in a bandage to stop him opening his mouth and said there had been complications and he would need to see a specialist.

The woman is clearly both a quasi-psychopath and a criminal, but the ex-boyfriend was a complete idiot to have gone to his ex-girlfriend when he needed a dentist. This is a classic Gamma move, failing to understand that men and women are different and assuming that a woman will behave like he himself would in a similar situation.