While Syndi can be an arrogant narcissistic asshole

He feels like he doesn't... Fit with Sparkles and Ant

The two Demi-gods had known each other since birth, and have only split once

Syndi practically convinced Sparkles to date him, then begged and whined to date both so he could stay with sparkles.

He wasn't told about them being Demi-gods, he had to learn on his own. And they still hold secrets from him

He feels like a puzzle piece that forced itself to fit next to them, while Sparkles and Ant fit perfectly