It’s tough being around your ex, especially if the breakup was rough and didn’t end well. It’s a lot better when it ends amicably, but that’s not usually the case. Breakups also tend to turn someone into one of those arrogant people who feel like they need to prove something to their ex. Maybe it’s a way of coping or trying to show them what they’re missing. This is especially true if you’re the one who was broken up with.
This guy felt that he needed to show off to his ex and her new boyfriend but instead ended up humiliating himself. He crashed his car into a pole after trying to show it off. The embarrassment is cringe-worthy (via Constative).