Eridan is such a sad story.
Vriska gets bored with him, Feferi can't take any more of his theatrics, and because of that all doesn't want a red romance with him. He naturally hates Sollux, the guy she goes red for, and tries to make him a rival. And Terezi doesn't want to be the auspistice. And finally Rose doesn't want anything to do with any of his alien romance.
The dude has it tough. :<