Dealing with retroactive jealousy

[Philippus Flavius Homovallumus]

My first thought: You need to do something even more depraved with your girlfriend. You can't take back what happened with her ex, but you can try to top it!

Disclaimer: I am not a psychologist, and hardly the best person to be giving relationship advice.

Sounds like good advice

punch him in the head

Talking about the sex you used to have is a sign of disrespect.

Intolerable

Sounds like good advice.

You're obsessing because it's challenged your masculinity.

Here's another thought - he's her ex, you're not. You're the better man.