https://screenrant.com/seinfeld-jerry-ellen-girlfriend-breakup-explainer/

Ellen seemed like the perfect love interest for Jerry in Seinfeld, but he broke up with her — and the show leaves the reason why strangely ambiguous.

I think he couldn't really get over that she went out on their first date on her birthday. That is odd. He probably felt nobody else took her out on her birthday, not a friend or a relative. She was supposed to be a loser.

Reason? What reason? People without feelings don't need reasons!

^LOL

And that salty discharge? It's nothing!